init

.cursor/rules/api_usage.mdc

@@ -0,0 +1,105 @@
+---
+description: For tasks requiring sending Telegram server API requests or working with generated API types.
+globs:
+alwaysApply: false
+---
+# Telegram Desktop API Usage
+
+## API Schema
+
+The API definitions are described using [TL Language]\(https:/core.telegram.org/mtproto/TL) in two main schema files:
+
+1.  **`Telegram/SourceFiles/mtproto/scheme/mtproto.tl`**
+    *   Defines the core MTProto protocol types and methods used for basic communication, encryption, authorization, service messages, etc.
+    *   Some fundamental types and methods from this schema (like basic types, RPC calls, containers) are often implemented directly in the C++ MTProto core (`SourceFiles/mtproto/`) and may be skipped during the C++ code generation phase.
+    *   Other parts of `mtproto.tl` might still be processed by the code generator.
+
+2.  **`Telegram/SourceFiles/mtproto/scheme/api.tl`**
+    *   Defines the higher-level Telegram API layer, including all the methods and types related to chat functionality, user profiles, messages, channels, stickers, etc.
+    *   This is the primary schema used when making functional API requests within the application.
+
+Both files use the same TL syntax to describe API methods (functions) and types (constructors).
+
+## Code Generation
+
+A custom code generation tool processes `api.tl` (and parts of `mtproto.tl`) to create corresponding C++ classes and types. These generated headers are typically included via the Precompiled Header (PCH) for the main `Telegram` project.
+
+Generated types often follow the pattern `MTP[Type]` (e.g., `MTPUser`, `MTPMessage`) and methods correspond to functions within the `MTP` namespace or related classes (e.g., `MTPmessages_SendMessage`).
+
+## Making API Requests
+
+API requests are made using a standard pattern involving the `api()` object (providing access to the `MTP::Instance`), the generated `MTP...` request object, callback handlers for success (`.done()`) and failure (`.fail()`), and the `.send()` method.
+
+Here's the general structure:
+
+```cpp
+// Include necessary headers if not already in PCH
+
+// Obtain the API instance (usually via api() or MTP::Instance::Get())
+api().request(MTPnamespace_MethodName(
+    // Constructor arguments based on the api.tl definition for the method
+    MTP_flags(flags_value),      // Use MTP_flags if the method has flags
+    MTP_inputPeer(peer),         // Use MTP_... types for parameters
+    MTP_string(messageText),
+    MTP_long(randomId),
+    // ... other arguments matching the TL definition
+    MTP_vector<MTPMessageEntity>() // Example for a vector argument
+)).done([=]\(const MTPResponseType &result) {
+    // Handle the successful response (result).
+    // 'result' will be of the C++ type corresponding to the TL type
+    // specified after the '=' in the api.tl method definition.
+    // How to access data depends on whether the TL type has one or multiple constructors:
+
+    // 1. Multiple Constructors (e.g., User = User | UserEmpty):
+    //    Use .match() with lambdas for each constructor:
+    result.match([&]\(const MTPDuser &data) {
+        /* use data.vfirst_name().v, etc. */
+    }, [&]\(const MTPDuserEmpty &data) {
+        /* handle empty user */
+    });
+
+    //    Alternatively, check the type explicitly and use the constructor getter:
+    if (result.type() == mtpc_user) {
+        const auto &data = result.c_user(); // Asserts if type is not mtpc_user!
+        // use data.vfirst_name().v
+    } else if (result.type() == mtpc_userEmpty) {
+        const auto &data = result.c_userEmpty();
+        // handle empty user
+    }
+
+    // 2. Single Constructor (e.g., Messages = messages { msgs: vector<Message> }):
+    //    Use .match() with a single lambda:
+    result.match([&]\(const MTPDmessages &data) { /* use data.vmessages().v */ });
+
+    //    Or check the type explicitly and use the constructor getter:
+    if (result.type() == mtpc_messages) {
+        const auto &data = result.c_messages(); // Asserts if type is not mtpc_messages!
+        // use data.vmessages().v
+    }
+
+    //    Or use the shortcut .data() for single-constructor types:
+    const auto &data = result.data(); // Only works for single-constructor types!
+    // use data.vmessages().v
+
+}).fail([=]\(const MTP::Error &error) {
+    // Handle the API error (error).
+    // 'error' is an MTP::Error object containing the error code (error.type())
+    // and description (error.description()). Check for specific error strings.
+    if (error.type() == u"FLOOD_WAIT_X"_q) {
+        // Handle flood wait
+    } else {
+        Ui::show(Box<InformBox>(Lang::Hard::ServerError())); // Example generic error handling
+    }
+}).handleFloodErrors().send(); // handleFloodErrors() is common, then send()
+```
+
+**Key Points:**
+
+*   Always refer to `Telegram/SourceFiles/mtproto/scheme/api.tl` for the correct method names, parameters (names and types), and response types.
+*   Use the generated `MTP...` types/classes for request parameters (e.g., `MTP_int`, `MTP_string`, `MTP_bool`, `MTP_vector`, `MTPInputUser`, etc.) and response handling.
+*   The `.done()` lambda receives the specific C++ `MTP...` type corresponding to the TL return type.
+    *   For types with **multiple constructors** (e.g., `User = User | UserEmpty`), use `result.match([&]\(const MTPDuser &d){ ... }, [&]\(const MTPDuserEmpty &d){ ... })` to handle each case, or check `result.type() == mtpc_user` / `mtpc_userEmpty` and call the specific `result.c_user()` / `result.c_userEmpty()` getter (which asserts on type mismatch).
+    *   For types with a **single constructor** (e.g., `Messages = messages{...}`), you can use `result.match([&]\(const MTPDmessages &d){ ... })` with one lambda, or check `type()` and call `c_messages()`, or use the shortcut `result.data()` to access the fields directly.
+*   The `.fail()` lambda receives an `MTP::Error` object. Check `error.type()` against known error strings (often defined as constants or using `u"..."_q` literals).
+*   Directly construct the `MTPnamespace_MethodName(...)` object inside `request()`.
+*   Include `.handleFloodErrors()` before `.send()` for standard flood wait handling.

.cursor/rules/localization.mdc

@@ -0,0 +1,164 @@
+---
+description: For tasks requiring changing or adding user facing phrases and text parts.
+globs:
+alwaysApply: false
+---
+# Telegram Desktop Localization
+
+## Coding Style Note
+
+**Use `auto`:** In the actual codebase, variable types are almost always deduced using `auto` (or `const auto`, `const auto &`) rather than being written out explicitly. Examples in this guide may use explicit types for clarity, but prefer `auto` in practice.
+
+```cpp
+// Prefer this:
+auto currentTitle = tr::lng_settings_title(tr::now);
+auto nameProducer = GetNameProducer(); // Returns rpl::producer<...>
+
+// Instead of this:
+QString currentTitle = tr::lng_settings_title(tr::now);
+rpl::producer<QString> nameProducer = GetNameProducer();
+```
+
+## String Resource File
+
+Base user-facing English strings are defined in the `lang.strings` file:
+
+`Telegram/Resources/langs/lang.strings`
+
+This file uses a key-value format with named placeholders:
+
+```
+"lng_settings_title" = "Settings";
+"lng_confirm_delete_item" = "Are you sure you want to delete {item_name}?";
+"lng_files_selected" = "{count} files selected"; // Simple count example (see Pluralization)
+```
+
+Placeholders are enclosed in curly braces, e.g., `{name}`, `{user}`. A special placeholder `{count}` is used for pluralization rules.
+
+### Pluralization
+
+For keys that depend on a number (using the `{count}` placeholder), English typically requires two forms: singular and plural. These are defined in `lang.strings` using `#one` and `#other` suffixes:
+
+```
+"lng_files_selected#one" = "{count} file selected";
+"lng_files_selected#other" = "{count} files selected";
+```
+
+While only `#one` and `#other` are defined in the base `lang.strings`, the code generation process creates C++ accessors for all six CLDR plural categories (`#zero`, `#one`, `#two`, `#few`, `#many`, `#other`) to support languages with more complex pluralization rules.
+
+## Translation Process
+
+While `lang.strings` provides the base English text and the keys, the actual translations are managed via Telegram's translations platform (translations.telegram.org) and loaded dynamically at runtime from the API. The keys from `lang.strings` (including the `#one`/`#other` variants) are used on the platform.
+
+## Code Generation
+
+A code generation tool processes `lang.strings` to create C++ structures and accessors within the `tr` namespace. These allow type-safe access to strings and handling of placeholders and pluralization. Generated keys typically follow the pattern `tr::lng_key_name`.
+
+## String Usage in Code
+
+Strings are accessed in C++ code using the generated objects within the `tr::` namespace. There are two main ways to use them: reactively (returning an `rpl::producer`) or immediately (returning the current value).
+
+### 1. Reactive Usage (rpl::producer)
+
+Calling a generated string function directly returns a reactive producer, typically `rpl::producer<QString>`. This producer automatically updates its value whenever the application language changes.
+
+```cpp
+// Key: "settings_title" = "Settings";
+auto titleProducer = tr::lng_settings_title(); // Type: rpl::producer<QString>
+
+// Key: "confirm_delete_item" = "Are you sure you want to delete {item_name}?";
+auto itemNameProducer = /* ... */; // Type: rpl::producer<QString>
+auto confirmationProducer = tr::lng_confirm_delete_item( // Type: rpl::producer<QString>
+    tr::now, // NOTE: tr::now is NOT passed here for reactive result
+    lt_item_name,
+    std::move(itemNameProducer)); // Placeholder producers should be moved
+```
+
+### 2. Immediate Usage (Current Value)
+
+Passing `tr::now` as the first argument retrieves the string's current value in the active language (typically as a `QString`).
+
+```cpp
+// Key: "settings_title" = "Settings";
+auto currentTitle = tr::lng_settings_title(tr::now); // Type: QString
+
+// Key: "confirm_delete_item" = "Are you sure you want to delete {item_name}?";
+const auto currentItemName = QString("My Document"); // Type: QString
+auto currentConfirmation = tr::lng_confirm_delete_item( // Type: QString
+    tr::now, // Pass tr::now for immediate value
+    lt_item_name, currentItemName); // Placeholder value is a direct QString (or convertible)
+```
+
+### 3. Placeholders (`{tag}`)
+
+Placeholders like `{item_name}` are replaced by providing arguments after `tr::now` (for immediate) or as the initial arguments (for reactive). A corresponding `lt_tag_name` constant is passed before the value.
+
+*   **Immediate:** Pass the direct value (e.g., `QString`, `int`).
+*   **Reactive:** Pass an `rpl::producer` of the corresponding type (e.g., `rpl::producer<QString>`). Remember to `std::move` the producer or use `rpl::duplicate` if you need to reuse the original producer afterwards.
+
+### 4. Pluralization (`{count}`)
+
+Keys using `{count}` require a numeric value for the `lt_count` placeholder. The correct plural form (`#zero`, `#one`, ..., `#other`) is automatically selected based on this value and the current language rules.
+
+*   **Immediate (`tr::now`):** Pass a `float64` or `int` (which is auto-converted to `float64`).
+    ```cpp
+    int count = 1;
+    auto filesText = tr::lng_files_selected(tr::now, lt_count, count); // Type: QString
+    count = 5;
+    filesText = tr::lng_files_selected(tr::now, lt_count, count); // Uses "files_selected#other"
+    ```
+
+*   **Reactive:** Pass an `rpl::producer<float64>`. Use the `tr::to_count()` helper to convert an `rpl::producer<int>` or wrap a single value.
+    ```cpp
+    // From an existing int producer:
+    auto countProducer = /* ... */; // Type: rpl::producer<int>
+    auto filesTextProducer = tr::lng_files_selected( // Type: rpl::producer<QString>
+        lt_count,
+        countProducer | tr::to_count()); // Use tr::to_count() for conversion
+
+    // From a single int value wrapped reactively:
+    int currentCount = 5;
+    auto filesTextProducerSingle = tr::lng_files_selected( // Type: rpl::producer<QString>
+        lt_count,
+        rpl::single(currentCount) | tr::to_count());
+        // Alternative for single values (less common): rpl::single(currentCount * 1.)
+    ```
+
+### 5. Custom Projectors
+
+An optional final argument can be a projector function (like `Ui::Text::Upper` or `Ui::Text::WithEntities`) to transform the output.
+
+*   If the projector returns `OutputType`, the string function returns `OutputType` (immediate) or `rpl::producer<OutputType>` (reactive).
+*   Placeholder values must match the projector's *input* requirements. For `Ui::Text::WithEntities`, placeholders expect `TextWithEntities` (immediate) or `rpl::producer<TextWithEntities>` (reactive).
+
+```cpp
+// Immediate with Ui::Text::WithEntities projector
+// Key: "user_posted_photo" = "{user} posted a photo";
+const auto userName = TextWithEntities{ /* ... */ }; // Type: TextWithEntities
+auto message = tr::lng_user_posted_photo( // Type: TextWithEntities
+    tr::now,
+    lt_user,
+    userName, // Must be TextWithEntities
+    Ui::Text::WithEntities); // Projector
+
+// Reactive with Ui::Text::WithEntities projector
+auto userNameProducer = /* ... */; // Type: rpl::producer<TextWithEntities>
+auto messageProducer = tr::lng_user_posted_photo( // Type: rpl::producer<TextWithEntities>
+    lt_user,
+    std::move(userNameProducer), // Move placeholder producers
+    Ui::Text::WithEntities); // Projector
+```
+
+## Key Summary
+
+*   Keys are defined in `Resources/langs/lang.strings` using `{tag}` placeholders.
+*   Plural keys use `{count}` and have `#one`/`#other` variants in `lang.strings`.
+*   Access keys via `tr::lng_key_name(...)` in C++.
+*   Call with `tr::now` as the first argument for the immediate `QString` (or projected type).
+*   Call without `tr::now` for the reactive `rpl::producer<QString>` (or projected type).
+*   Provide placeholder values (`lt_tag_name, value`) matching the usage (direct value for immediate, `rpl::producer` for reactive). Producers should typically be moved via `std::move`.
+*   For `{count}`:
+    *   Immediate: Pass `int` or `float64`.
+    *   Reactive: Pass `rpl::producer<float64>`, typically by converting an `int` producer using `| tr::to_count()`.
+*   Optional projector function as the last argument modifies the output type and required placeholder types.
+*   Actual translations are loaded at runtime from the API.

.cursor/rules/rpl_guide.mdc

@@ -0,0 +1,216 @@
+---
+description:
+globs:
+alwaysApply: true
+---
+# RPL (Reactive Programming Library) Guide
+
+## Coding Style Note
+
+**Use `auto`:** In the actual codebase, variable types are almost always deduced using `auto` (or `const auto`, `const auto &`) rather than being written out explicitly. Examples in this guide may use explicit types for clarity, but prefer `auto` in practice.
+
+```cpp
+// Prefer this:
+auto intProducer = rpl::single(123);
+const auto &lifetime = existingLifetime;
+
+// Instead of this:
+rpl::producer<int> intProducer = rpl::single(123);
+const rpl::lifetime &lifetime = existingLifetime;
+
+// Sometimes needed if deduction is ambiguous or needs help:
+auto user = std::make_shared<UserData>();
+auto data = QByteArray::fromHex("...");
+```
+
+## Introduction
+
+RPL is the reactive programming library used in this project, residing in the `rpl::` namespace. It allows handling asynchronous streams of data over time.
+
+The core concept is the `rpl::producer`, which represents a stream of values that can be generated over a certain lifetime.
+
+## Producers: `rpl::producer<Type, Error = no_error>`
+
+The fundamental building block is `rpl::producer<Type, Error>`. It produces values of `Type` and can optionally signal an error of type `Error`. By default, `Error` is `rpl::no_error`, indicating that the producer does not explicitly handle error signaling through this mechanism.
+
+```cpp
+// A producer that emits integers.
+auto intProducer = /* ... */; // Type: rpl::producer<int>
+
+// A producer that emits strings and can potentially emit a CustomError.
+auto stringProducerWithError = /* ... */; // Type: rpl::producer<QString, CustomError>
+```
+
+Producers are typically lazy; they don't start emitting values until someone subscribes to them.
+
+## Lifetime Management: `rpl::lifetime`
+
+Reactive pipelines have a limited duration, managed by `rpl::lifetime`. An `rpl::lifetime` object essentially holds a collection of cleanup callbacks. When the lifetime ends (either explicitly destroyed or goes out of scope), these callbacks are executed, tearing down the associated pipeline and freeing resources.
+
+```cpp
+rpl::lifetime myLifetime;
+// ... later ...
+// myLifetime is destroyed, cleanup happens.
+
+// Or, pass a lifetime instance to manage a pipeline's duration.
+rpl::lifetime &parentLifetime = /* ... get lifetime from context ... */;
+```
+
+## Starting a Pipeline: `rpl::start_...`
+
+To consume values from a producer, you start a pipeline using one of the `rpl::start_...` methods. These methods subscribe to the producer and execute callbacks for the events they handle.
+
+The most common method is `rpl::on_next`:
+
+```cpp
+auto counter = /* ... */; // Type: rpl::producer<int>
+rpl::lifetime lifetime;
+
+// Counter is consumed here, use std::move if it's an l-value.
+std::move(
+    counter
+) | rpl::on_next([=]\(int nextValue) {
+    // Process the next integer value emitted by the producer.
+    qDebug() << "Received: " << nextValue;
+}, lifetime); // Pass the lifetime to manage the subscription.
+// Note: `counter` is now in a moved-from state and likely invalid.
+
+// If you need to start the same producer multiple times, duplicate it:
+// rpl::duplicate(counter) | rpl::on_next(...);
+
+// If you DON'T pass a lifetime to a start_... method:
+auto counter2 = /* ... */; // Type: rpl::producer<int>
+rpl::lifetime subscriptionLifetime = std::move(
+    counter2
+) | rpl::on_next([=]\(int nextValue) { /* ... */ });
+// The returned lifetime MUST be stored. If it's discarded immediately,
+// the subscription stops instantly.
+// `counter2` is also moved-from here.
+```
+
+Other variants allow handling errors (`_error`) and completion (`_done`):
+
+```cpp
+auto dataStream = /* ... */; // Type: rpl::producer<QString, Error>
+rpl::lifetime lifetime;
+
+// Assuming dataStream might be used again, we duplicate it for the first start.
+// If it's the only use, std::move(dataStream) would be preferred.
+rpl::duplicate(
+    dataStream
+) | rpl::on_error([=]\(Error &&error) {
+    // Handle the error signaled by the producer.
+    qDebug() << "Error: " << error.text();
+}, lifetime);
+
+// Using dataStream again, perhaps duplicated again or moved if last use.
+rpl::duplicate(
+    dataStream
+) | rpl::on_done([=] {
+    // Execute when the producer signals it's finished emitting values.
+    qDebug() << "Stream finished.";
+}, lifetime);
+
+// Last use of dataStream, so we move it.
+std::move(
+    dataStream
+) | rpl::on_next_error_done(
+    [=]\(QString &&value) { /* handle next value */ },
+    [=]\(Error &&error) { /* handle error */ },
+    [=] { /* handle done */ },
+    lifetime);
+```
+
+## Transforming Producers
+
+RPL provides functions to create new producers by transforming existing ones:
+
+*   `rpl::map`: Transforms each value emitted by a producer.
+    ```cpp
+    auto ints = /* ... */; // Type: rpl::producer<int>
+    // The pipe operator often handles the move implicitly for chained transformations.
+    auto strings = std::move(
+        ints // Explicit move is safer
+    ) | rpl::map([](int value) {
+        return QString::number(value * 2);
+    }); // Emits strings like "0", "2", "4", ...
+    ```
+
+*   `rpl::filter`: Emits only the values from a producer that satisfy a condition.
+    ```cpp
+    auto ints = /* ... */; // Type: rpl::producer<int>
+    auto evenInts = std::move(
+        ints // Explicit move is safer
+    ) | rpl::filter([](int value) {
+        return (value % 2 == 0);
+    }); // Emits only even numbers.
+    ```
+
+## Combining Producers
+
+You can combine multiple producers into one:
+
+*   `rpl::combine`: Combines the latest values from multiple producers whenever *any* of them emits a new value. Requires all producers to have emitted at least one value initially.
+    While it produces a `std::tuple`, subsequent operators like `map`, `filter`, and `start_with_next` can automatically unpack this tuple into separate lambda arguments.
+    ```cpp
+    auto countProducer = rpl::single(1); // Type: rpl::producer<int>
+    auto textProducer = rpl::single(u"hello"_q); // Type: rpl::producer<QString>
+    rpl::lifetime lifetime;
+
+    // rpl::combine takes producers by const-ref internally and duplicates,
+    // so move/duplicate is usually not strictly needed here unless you
+    // want to signal intent or manage the lifetime of p1/p2 explicitly.
+    auto combined = rpl::combine(
+        countProducer, // or rpl::duplicate(countProducer)
+        textProducer   // or rpl::duplicate(textProducer)
+    );
+
+    // Starting the combined producer consumes it.
+    // The lambda receives unpacked arguments, not the tuple itself.
+    std::move(
+        combined
+    ) | rpl::on_next([=]\(int count, const QString &text) {
+        // No need for std::get<0>(latest), etc.
+        qDebug() << "Combined: Count=" << count << ", Text=" << text;
+    }, lifetime);
+
+    // This also works with map, filter, etc.
+    std::move(
+        combined
+    ) | rpl::filter([=]\(int count, const QString &text) {
+        return count > 0 && !text.isEmpty();
+    }) | rpl::map([=]\(int count, const QString &text) {
+        return text.repeated(count);
+    }) | rpl::on_next([=]\(const QString &result) {
+        qDebug() << "Mapped & Filtered: " << result;
+    }, lifetime);
+    ```
+
+*   `rpl::merge`: Merges the output of multiple producers of the *same type* into a single producer. It emits a value whenever *any* of the source producers emits a value.
+    ```cpp
+    auto sourceA = /* ... */; // Type: rpl::producer<QString>
+    auto sourceB = /* ... */; // Type: rpl::producer<QString>
+
+    // rpl::merge also duplicates internally.
+    auto merged = rpl::merge(sourceA, sourceB);
+
+    // Starting the merged producer consumes it.
+    std::move(
+        merged
+    ) | rpl::on_next([=]\(QString &&value) {
+        // Receives values from either sourceA or sourceB as they arrive.
+        qDebug() << "Merged value: " << value;
+    }, lifetime);
+    ```
+
+## Key Concepts Summary
+
+*   Use `rpl::producer<Type, Error>` to represent streams of values.
+*   Manage subscription duration using `rpl::lifetime`.
+*   Pass `rpl::lifetime` to `rpl::start_...` methods.
+*   If `rpl::lifetime` is not passed, **store the returned lifetime** to keep the subscription active.
+*   Use operators like `| rpl::map`, `| rpl::filter` to transform streams.
+*   Use `rpl::combine` or `rpl::merge` to combine streams.
+*   When starting a chain (`std::move(producer) | rpl::map(...)`), explicitly move the initial producer.
+*   These functions typically duplicate their input producers internally.
+*   Starting a pipeline consumes the producer; use `

.cursor/rules/styling.mdc

@@ -0,0 +1,154 @@
+---
+description: For tasks requiring working with user facing UI components.
+globs:
+alwaysApply: false
+---
+# Telegram Desktop UI Styling
+
+## Style Definition Files
+
+UI element styles (colors, fonts, paddings, margins, icons, etc.) are defined in `.style` files using a custom syntax. These files are located alongside the C++ source files they correspond to within specific UI component directories (e.g., `Telegram/SourceFiles/ui/chat/chat.style`).
+
+Definitions from other `.style` files can be included using the `using` directive at the top of the file:
+```style
+using "ui/basic.style";
+using "ui/widgets/widgets.style";
+```
+
+The central definition of named colors happens in `Telegram/SourceFiles/ui/colors.palette`. This file allows for theme generation and loading colors from various sources.
+
+### Syntax Overview
+
+1.  **Built-in Types:** The syntax recognizes several base types inferred from the value assigned:
+    *   `int`: Integer numbers (e.g., `lineHeight: 20;`)
+    *   `bool`: Boolean values (e.g., `useShadow: true;`)
+    *   `pixels`: Pixel values, ending with `px` (e.g., `borderWidth: 1px;`). Generated as `int` in C++.
+    *   `color`: Named colors defined in `colors.palette` (e.g., `background: windowBg;`)
+    *   `icon`: Defined inline using a specific syntax (see below). Generates `style::icon`.
+    *   `margins`: Four pixel values for margins or padding. Requires `margins(top, right, bottom, left)` syntax (e.g., `margin: margins(10px, 5px, 10px, 5px);` or `padding: margins(8px, 8px, 8px, 8px);`). Generates `style::margins` (an alias for `QMargins`).
+    *   `size`: Two pixel values for width and height (e.g., `iconSize: size(16px, 16px);`). Generates `style::size`.
+    *   `point`: Two pixel values for x and y coordinates (e.g., `textPos: point(5px, 2px);`). Generates `style::point`.
+    *   `align`: Alignment keywords (e.g., `textAlign: align(center);` or `iconAlign: align(left);`). Generates `style::align`.
+    *   `font`: Font definitions (e.g., `font: font(14px semibold);`). Generates `style::font`.
+    *   `double`: Floating point numbers (e.g., `disabledOpacity: 0.5;`)
+
+    *Note on Borders:* Borders are typically defined using multiple fields like `border: pixels;` (for width) and `borderFg: color;` (for color), rather than a single CSS-like property.
+
+2.  **Structure Definition:** You can define complex data structures directly within the `.style` file:
+    ```style
+    MyButtonStyle { // Defines a structure named 'MyButtonStyle'
+      textPadding: margins; // Field 'textPadding' expects margins type
+      icon: icon;         // Field 'icon' of type icon
+      height: pixels;     // Field 'height' of type pixels
+    }
+    ```
+    This generates a `struct MyButtonStyle { ... };` inside the `namespace style`. Fields will have corresponding C++ types (`style::margins`, `style::icon`, `int`).
+
+3.  **Variable Definition & Inheritance:** Variables are defined using `name: value;` or `groupName { ... }`. They can be of built-in types or custom structures. Structures can be initialized inline or inherit from existing variables.
+
+    **Icon Definition Syntax:** Icons are defined inline using the `icon{...}` syntax. The generator probes for `.svg` files or `.png` files (including `@2x`, `@3x` variants) based on the provided path stem.
+    ```style
+    // Single-part icon definition:
+    myIconSearch: icon{{ "gui/icons/search", iconColor }};
+    // Multi-part icon definition (layers drawn bottom-up):
+    myComplexIcon: icon{
+      { "gui/icons/background", iconBgColor },
+      { "gui/icons/foreground", iconFgColor }
+    };
+    // Icon with path modifiers (PNG only for flips, SVG only for size):
+    myFlippedIcon: icon{{ "gui/icons/arrow-flip_horizontal", arrowColor }};
+    myResizedIcon: icon{{ "gui/icons/logo-128x128", logoColor }}; // Forces 128x128 for SVG
+    ```
+
+    **Other Variable Examples:**
+    ```style
+    // Simple variables
+    buttonHeight: 30px;
+    activeButtonColor: buttonBgActive; // Named color from colors.palette
+
+    // Variable of a custom structure type, initialized inline
+    defaultButton: MyButtonStyle {
+      textPadding: margins(10px, 15px, 10px, 15px); // Use margins(...) syntax
+      icon: myIconSearch; // Assign the previously defined icon variable
+      height: buttonHeight; // Reference another variable
+    }
+
+    // Another variable inheriting from 'defaultButton' and overriding/adding fields
+    primaryButton: MyButtonStyle(defaultButton) {
+      icon: myComplexIcon; // Override icon with the multi-part one
+      backgroundColor: activeButtonColor; // Add a field not in MyButtonStyle definition
+    }
+
+    // Style group (often used for specific UI elements)
+    chatInput { // Example using separate border properties and explicit padding
+      border: 1px;                          // Border width
+      borderFg: defaultInputFieldBorder;    // Border color (named color)
+      padding: margins(5px, 10px, 5px, 10px); // Use margins(...) syntax for padding field
+      backgroundColor: defaultChatBg;       // Background color
+    }
+    ```
+
+## Code Generation
+
+A code generation tool processes these `.style` files and `colors.palette` to create C++ objects.
+- The `using` directives resolve dependencies between `.style` files.
+- Custom structure definitions (like `MyButtonStyle`) generate corresponding `struct MyButtonStyle { ... };` within the `namespace style`.
+- Style variables/groups (like `defaultButton`, `primaryButton`, `chatInput`) are generated as objects/structs within the `st` namespace (e.g., `st::defaultButton`, `st::primaryButton`, `st::chatInput`). These generated structs contain members corresponding to the fields defined in the `.style` file.
+- Color objects are generated into the `st` namespace as well, based on their names in `colors.palette` (e.g., `st::windowBg`, `st::buttonBgActive`).
+- The generated header files for styles are placed in the `Telegram/SourceFiles/styles/` directory with a `style_` prefix (e.g., `styles/style_widgets.h` for `ui/widgets/widgets.style`). You include them like `#include "styles/style_widgets.h"`.
+
+Generated C++ types correspond to the `.style` types: `style::color`, `style::font`, `style::margins` (used for both `margin:` and `padding:` fields), `style::icon`, `style::size`, `style::point`, `style::align`, and `int` or `bool` for simple types.
+
+## Style Usage in Code
+
+Styles are applied in C++ code by referencing the generated `st::...` objects and their members.
+
+```cpp
+// Example: Including the generated style header
+#include "styles/style_widgets.h" // For styles defined in ui/widgets/widgets.style
+
+// ... inside some UI class code ...
+
+// Accessing members of a generated style struct
+int height = st::primaryButton.height; // Accessing the 'height' field (pixels -> int)
+const style::icon &icon = st::primaryButton.icon; // Accessing the 'icon' field (st::myComplexIcon)
+style::margins padding = st::primaryButton.textPadding; // Accessing 'textPadding'
+style::color bgColor = st::primaryButton.backgroundColor; // Accessing the color (st::activeButtonColor)
+
+// Applying styles (conceptual examples)
+myButton->setIcon(st::primaryButton.icon);
+myButton->setHeight(st::primaryButton.height);
+myButton->setPadding(st::primaryButton.textPadding);
+myButton->setBackgroundColor(st::primaryButton.backgroundColor);
+
+// Using styles directly in painting
+void MyWidget::paintEvent(QPaintEvent *e) {
+    Painter p(this);
+    p.fillRect(rect(), st::chatInput.backgroundColor); // Use color from chatInput style
+
+    // Border painting requires width and color
+    int borderWidth = st::chatInput.border; // Access border width (pixels -> int)
+    style::color borderColor = st::chatInput.borderFg; // Access border color
+    if (borderWidth > 0) {
+        p.setPen(QPen(borderColor, borderWidth));
+        // Adjust rect for pen width if needed before drawing
+        p.drawRect(rect().adjusted(borderWidth / 2, borderWidth / 2, -borderWidth / 2, -borderWidth / 2));
+    }
+
+    // Access padding (style::margins)
+    style::margins inputPadding = st::chatInput.padding;
+    // ... use inputPadding.top(), inputPadding.left() etc. for content layout ...
+}
+```
+
+**Key Points:**
+
+*   Styles are defined in `.style` files next to their corresponding C++ source files.
+*   `using "path/to/other.style";` includes definitions from other style files.
+*   Named colors are defined centrally in `ui/colors.palette`.
+*   `.style` syntax supports built-in types (like `pixels`, `color`, `margins`, `point`, `size`, `align`, `font`, `double`), custom structure definitions (`Name { field: type; ... }`), variable definitions (`name: value;`), and inheritance (`child: Name(parent) { ... }`).
+*   Values must match the expected type (e.g., fields declared as `margins` type, like `margin:` or `padding:`, require `margins(...)` syntax). Borders are typically set via separate `border: pixels;` and `borderFg: color;` fields.
+*   Icons are defined inline using `name: icon{{ "path_stem", color }};` or `name: icon{ { "path1", c1 }, ... };` syntax, with optional path modifiers.
+*   Code generation creates `struct` definitions in the `style` namespace for custom types and objects/structs in the `st` namespace for defined variables/groups.
+*   Generated headers are in `styles/` with a `style_` prefix and must be included.
+*   Access style properties via the generated `st::` objects (e.g., `st::primaryButton.height`, `st::chatInput.backgroundColor`).

.cursorignore

@@ -0,0 +1,2 @@
+# Add directories or file patterns to ignore during indexing (e.g. foo/ or *.csv)
+Telegram/ThirdParty/

.devcontainer.json

@@ -0,0 +1,30 @@
+{
+    "name": "CentOS",
+    "image": "tdesktop:centos_env",
+    "customizations": {
+        "vscode": {
+            "settings": {
+                "C_Cpp.intelliSenseEngine": "disabled",
+                "cmake.generator": "Ninja Multi-Config",
+                "cmake.buildDirectory": "${workspaceFolder}/out",
+                "cmake.copyCompileCommands": "${workspaceFolder}/compile_commands.json"
+            },
+            "extensions": [
+                "ms-vscode.cpptools-extension-pack",
+                "llvm-vs-code-extensions.vscode-clangd",
+                "TheQtCompany.qt",
+                "ms-python.python",
+                "ms-azuretools.vscode-docker",
+                "eamodio.gitlens"
+            ]
+        }
+    },
+    "capAdd": [
+        "SYS_PTRACE"
+    ],
+    "securityOpt": [
+        "seccomp=unconfined"
+    ],
+    "workspaceMount": "source=${localWorkspaceFolder},target=/usr/src/tdesktop,type=bind,consistency=cached",
+    "workspaceFolder": "/usr/src/tdesktop"
+}

.envrc

@@ -0,0 +1 @@
+use nix;

.gitattributes

@@ -0,0 +1,9 @@
+# Set the default behavior, in case people don't have core.autocrlf set.
+* text=auto
+
+# Ensure diffs have LF endings
+*.diff text eol=lf
+*.bat text eol=crlf
+
+# Ensure lottie animations are treated as binary files
+*.lottie binary

.github/CONTRIBUTING.md

@@ -0,0 +1,118 @@
+# Contributing
+
+This document describes how you can contribute to Telegram Desktop. Please read it carefully.
+
+**Table of Contents**
+
+* [What contributions are accepted](#what-contributions-are-accepted)
+* [Build instructions](#build-instructions)
+* [Pull upstream changes into your fork regularly](#pull-upstream-changes-into-your-fork-regularly)
+* [How to get your pull request accepted](#how-to-get-your-pull-request-accepted)
+  * [Keep your pull requests limited to a single issue](#keep-your-pull-requests-limited-to-a-single-issue)
+    * [Squash your commits to a single commit](#squash-your-commits-to-a-single-commit)
+  * [Don't mix code changes with whitespace cleanup](#dont-mix-code-changes-with-whitespace-cleanup)
+  * [Keep your code simple!](#keep-your-code-simple)
+  * [Test your changes!](#test-your-changes)
+  * [Write a good commit message](#write-a-good-commit-message)
+
+## What contributions are accepted
+
+We highly appreciate your contributions in the matter of fixing bugs and optimizing the Telegram Desktop source code and its documentation. In case of fixing the existing user experience please push to your fork and [submit a pull request][pr].
+
+Wait for us. We try to review your pull requests as fast as possible.
+If we find issues with your pull request, we may suggest some changes and improvements.
+
+Unfortunately we **do not merge** any pull requests that have new feature implementations, translations to new languages and those which introduce any new user interface elements.
+
+If you have a translations-related contribution, check out [Translations platform][translate].
+
+Telegram Desktop is not a standalone application but a part of [Telegram project][telegram], so all the decisions about the features, languages, user experience, user interface and the design are made inside Telegram team, often according to some roadmap which is not public.
+
+## Build instructions
+
+See the [README.md][build_instructions] for details on the various build
+environments.
+
+## Pull upstream changes into your fork regularly
+
+Telegram Desktop is advancing quickly. It is therefore critical that you pull upstream changes into your fork on a regular basis. Nothing is worse than putting in a days of hard work into a pull request only to have it rejected because it has diverged too far from upstream.
+
+To pull in upstream changes:
+
+    git remote add upstream https://github.com/telegramdesktop/tdesktop.git
+    git fetch upstream master
+
+Check the log to be sure that you actually want the changes, before merging:
+
+    git log upstream/master
+
+Then rebase your changes on the latest commits in the `master` branch:
+
+    git rebase upstream/master
+
+After that, you have to force push your commits:
+
+    git push --force
+
+For more info, see [GitHub Help][help_fork_repo].
+
+## How to get your pull request accepted
+
+We want to improve Telegram Desktop with your contributions. But we also want to provide a stable experience for our users and the community. Follow these rules and you should succeed without a problem!
+
+### Keep your pull requests limited to a single issue
+
+Pull requests should be as small/atomic as possible. Large, wide-sweeping changes in a pull request will be **rejected**, with comments to isolate the specific code in your pull request. Some examples:
+
+* If you are making spelling corrections in the docs, don't modify other files.
+* If you are adding new functions don't '*cleanup*' unrelated functions. That cleanup belongs in another pull request.
+
+#### Squash your commits to a single commit
+
+To keep the history of the project clean, you should make one commit per pull request.
+If you already have multiple commits, you can add the commits together (squash them) with the following commands in Git Bash:
+
+1. Open `Git Bash` (or `Git Shell`)
+2. Enter following command to squash the recent {N} commits: `git reset --soft HEAD~{N} && git commit` (replace `{N}` with the number of commits you want to squash)
+3. Press <kbd>i</kbd> to get into Insert-mode
+4. Enter the commit message of the new commit
+5. After adding the message, press <kbd>ESC</kbd> to get out of the Insert-mode
+6. Write `:wq` and press <kbd>Enter</kbd> to save the new message or write `:q!` to discard your changes
+7. Enter `git push --force` to push the new commit to the remote repository
+
+For example, if you want to squash the last 5 commits, use `git reset --soft HEAD~5 && git commit`
+
+### Don't mix code changes with whitespace cleanup
+
+If you change two lines of code and correct 200 lines of whitespace issues in a file the diff on that pull request is functionally unreadable and will be **rejected**. Whitespace cleanups need to be in their own pull request.
+
+### Keep your code simple!
+
+Please keep your code as clean and straightforward as possible.
+Furthermore, the pixel shortage is over. We want to see:
+
+* `opacity` instead of `o`
+* `placeholder` instead of `ph`
+* `myFunctionThatDoesThings()` instead of `mftdt()`
+
+### Test your changes!
+
+Before you submit a pull request, please test your changes. Verify that Telegram Desktop still works and your changes don't cause other issue or crashes.
+
+### Write a good commit message
+
+* Explain why you make the changes. [More infos about a good commit message.][commit_message]
+
+* If you fix an issue with your commit, please close the issue by [adding one of the keywords and the issue number][closing-issues-via-commit-messages] to your commit message.
+
+  For example: `Fix #545`
+
+[//]: # (LINKS)
+[telegram]: https://telegram.org/
+[help_fork_repo]: https://help.github.com/articles/fork-a-repo/
+[help_change_commit_message]: https://help.github.com/articles/changing-a-commit-message/
+[commit_message]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
+[pr]: https://github.com/telegramdesktop/tdesktop/compare
+[build_instructions]: https://github.com/telegramdesktop/tdesktop/blob/master/README.md#build-instructions
+[closing-issues-via-commit-messages]: https://help.github.com/articles/closing-issues-via-commit-messages/
+[translate]: https://translations.telegram.org

.github/ISSUE_TEMPLATE/BUG_REPORT.yml

@@ -0,0 +1,78 @@
+name: Bug report
+description: Report errors or unexpected behavior.
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting issues of Telegram Desktop!
+
+        To make it easier for us to help you please enter detailed information below.
+  - type: textarea
+    attributes:
+      label: Steps to reproduce
+      placeholder: |
+        1. 
+        2. 
+        3. 
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Expected behaviour
+      placeholder: Tell us what should happen
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Actual behaviour
+      placeholder: Tell us what happens instead
+    validations:
+      required: true
+  - type: input
+    attributes:
+      label: Operating system
+      description: >
+        Your operating system name, version and desktop environment.
+        **Don't use kernel version (uname), it's useless.**
+    validations:
+      required: true
+  - type: input
+    attributes:
+      label: Version of Telegram Desktop
+      description: >
+        Please note we don't support versions from Linux distro repositories.
+        If you need support for these versions, **please contact your distro maintainer**
+        or your distro bugtracker.
+        **Don't use 'latest'**, specify actual version, **that's a reason to close your issue**.
+    validations:
+      required: true
+  - type: dropdown
+    attributes:
+      label: Installation source
+      multiple: false
+      options:
+        - Static binary from official website
+        - Microsoft Store
+        - Mac App Store
+        - Flatpak
+        - Snap
+        - Other (unofficial) source
+    validations:
+      required: true
+  - type: input
+    attributes:
+      label: Crash ID
+      description: >
+        If you're reporting a crash, please enter the crash ID from the crash reporter
+        opening on the next launch after crash. **You have to enable beta versions
+        installation in Settings -> Advanced for the reporter to appear.**
+        You don't have to wait for a beta version to arrive.
+  - type: textarea
+    attributes:
+      label: Logs
+      description: >
+        You can find log.txt using the `viewlogs`
+        [cheat code](https://github.com/telegramdesktop/tdesktop/wiki/Cheat-Codes).
+      placeholder: Insert log.txt here (if necessary)
+      render: shell

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.yml

@@ -0,0 +1,29 @@
+---
+name: Feature request
+description: Suggest an idea.
+labels: [enhancement]
+body:
+  - type: textarea
+    attributes:
+      label: Is your feature request related to a problem?
+      placeholder: A clear and concise description of what the problem is.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Describe the solution you'd like
+      placeholder: A clear and concise description of what you want to happen.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Describe alternatives you've considered
+      placeholder: A clear and concise description of any alternative solutions or features you've considered.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Additional context
+      placeholder: Add any other context or screenshots about the feature request here.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,11 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Platform-wide issue
+    url: https://bugs.telegram.org
+    about: Any bug report or feature request affecting more than only Telegram Desktop.
+  - name: Issue of other client
+    url: https://bugs.telegram.org
+    about: Any bug report or feature request not about Telegram Desktop.
+  - name: Question
+    url: https://t.me/TelegramDesktopTalk
+    about: Ask a question.

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/cant-reproduce.yml

@@ -0,0 +1,25 @@
+name: Can't reproduce.
+
+on:
+  schedule:
+    - cron: '0 3 * * *'
+
+jobs:
+  cant-reproduce:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: lee-dohm/no-response@v0.5.0
+        with:
+          token: ${{ github.token }}
+          responseRequiredLabel: cant reproduce
+          closeComment: >
+            This issue has been automatically closed because no developer succeeded to
+            reproduce the issue with the given reproduction steps. With only the
+            information that is currently in the issue, we don't have enough
+            information to take action. Please reach out if you find what's missing to
+            reproduce the issue so that we can investigate further.
+
+
+            Note that GitHub is a developer communication platform. If you're an ordinary
+            user seeking for help, get to support crew via `Settings -> Ask question` in
+            the application.

.github/workflows/copyright_year_updater.yml

@@ -0,0 +1,16 @@
+name: Copyright year updater.
+
+on:
+  repository_dispatch:
+    types: ["Restart copyright_year_updater workflow."]
+  schedule:
+    # At 03:00 on January 1.
+    - cron: "0 3 1 1 *"
+
+jobs:
+  Copyright-year:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: desktop-app/action_code_updater@master
+        with:
+          type: "license-year"

.github/workflows/docker.yml

@@ -0,0 +1,42 @@
+name: Docker.
+
+on:
+  push:
+    paths:
+      - '.github/workflows/docker.yml'
+      - 'Telegram/build/docker/centos_env/**'
+
+jobs:
+  docker:
+    name: Ubuntu
+    runs-on: ubuntu-latest
+    if: github.ref_name == github.event.repository.default_branch
+
+    env:
+      IMAGE_TAG: ghcr.io/${{ github.repository }}/centos_env:latest
+
+    steps:
+      - name: Clone.
+        uses: actions/checkout@v6
+        with:
+          submodules: recursive
+
+      - name: First set up.
+        run: |
+          sudo apt update
+          curl -sSL https://install.python-poetry.org | python3 -
+          echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u $ --password-stdin
+
+      - name: Free up some disk space.
+        uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be
+        with:
+          tool-cache: true
+
+      - name: Docker image build.
+        run: |
+          cd Telegram/build/docker/centos_env
+          poetry install
+          DEBUG= LTO= poetry run gen_dockerfile | DOCKER_BUILDKIT=1 docker build -t $IMAGE_TAG -
+
+      - name: Push the Docker image.
+        run: docker push $IMAGE_TAG

.github/workflows/issue_closer.yml

@@ -0,0 +1,14 @@
+name: Issue closer.
+
+on:
+  issues:
+    types: opened
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Process an issue.
+        uses: desktop-app/action_issue_closer@master
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/linux.yml

@@ -0,0 +1,157 @@
+name: Linux.
+
+on:
+  push:
+    paths-ignore:
+      - 'docs/**'
+      - '**.md'
+      - 'changelog.txt'
+      - 'LEGAL'
+      - 'LICENSE'
+      - '.github/**'
+      - '!.github/workflows/linux.yml'
+      - 'snap/**'
+      - 'Telegram/build/**'
+      - '!Telegram/build/docker/centos_env/**'
+      - 'Telegram/Resources/uwp/**'
+      - 'Telegram/Resources/winrc/**'
+      - 'Telegram/SourceFiles/platform/win/**'
+      - 'Telegram/SourceFiles/platform/mac/**'
+      - 'Telegram/Telegram/**'
+      - 'Telegram/configure.bat'
+      - 'Telegram/Telegram.plist'
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - '**.md'
+      - 'changelog.txt'
+      - 'LEGAL'
+      - 'LICENSE'
+      - '.github/**'
+      - '!.github/workflows/linux.yml'
+      - 'snap/**'
+      - 'Telegram/build/**'
+      - '!Telegram/build/docker/centos_env/**'
+      - 'Telegram/Resources/uwp/**'
+      - 'Telegram/Resources/winrc/**'
+      - 'Telegram/SourceFiles/platform/win/**'
+      - 'Telegram/SourceFiles/platform/mac/**'
+      - 'Telegram/Telegram/**'
+      - 'Telegram/configure.bat'
+      - 'Telegram/Telegram.plist'
+
+jobs:
+
+  linux:
+    name: Rocky Linux 8
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        defines:
+          - ""
+          - "DESKTOP_APP_DISABLE_X11_INTEGRATION"
+
+    env:
+      UPLOAD_ARTIFACT: "true"
+      ONLY_CACHE: "false"
+      IMAGE_TAG: tdesktop:centos_env
+
+    steps:
+      - name: Clone.
+        uses: actions/checkout@v6
+        with:
+          submodules: recursive
+
+      - name: First set up.
+        run: |
+          sudo apt update
+          curl -sSL https://install.python-poetry.org | python3 -
+          cd Telegram/build/docker/centos_env
+          poetry install
+          DOCKERFILE=$(DEBUG= LTO= poetry run gen_dockerfile)
+          echo "$DOCKERFILE" > Dockerfile
+          rm -rf __pycache__
+
+      - name: Free up some disk space.
+        uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be
+        with:
+          tool-cache: true
+
+      - name: Set up Docker Buildx.
+        uses: docker/setup-buildx-action@v3
+
+      - name: Libraries cache.
+        uses: actions/cache@v5
+        with:
+          path: ${{ runner.temp }}/.buildx-cache
+          key: ${{ runner.OS }}-libs-${{ hashFiles('Telegram/build/docker/centos_env/**') }}
+          restore-keys: ${{ runner.OS }}-libs-
+
+      - name: Libraries.
+        uses: docker/build-push-action@v6
+        with:
+          context: Telegram/build/docker/centos_env
+          load: ${{ env.ONLY_CACHE == 'false' }}
+          tags: ${{ env.IMAGE_TAG }}
+          cache-from: type=local,src=${{ runner.temp }}/.buildx-cache
+          cache-to: type=local,dest=${{ runner.temp }}/.buildx-cache-new,mode=max
+
+      - name: Move cache.
+        run: |
+          rm -rf ${{ runner.temp }}/.buildx-cache
+          mv ${{ runner.temp }}/.buildx-cache{-new,}
+
+      - name: Telegram Desktop build.
+        if: env.ONLY_CACHE == 'false'
+        run: |
+          DEFINE=""
+          if [ -n "${{ matrix.defines }}" ]; then
+            DEFINE="-D ${{ matrix.defines }}=ON"
+            echo Define from matrix: $DEFINE
+            echo "ARTIFACT_NAME=Telegram ${{ matrix.defines }}" >> $GITHUB_ENV
+          else
+            echo "ARTIFACT_NAME=Telegram" >> $GITHUB_ENV
+          fi
+
+          docker run --rm \
+          -u $(id -u) \
+          -v $PWD:/usr/src/tdesktop \
+          -e CONFIG=Debug \
+          $IMAGE_TAG \
+          /usr/src/tdesktop/Telegram/build/docker/centos_env/build.sh \
+          -D CMAKE_CONFIGURATION_TYPES=Debug \
+          -D CMAKE_C_FLAGS_DEBUG="-O0" \
+          -D CMAKE_CXX_FLAGS_DEBUG="-O0" \
+          -D CMAKE_COMPILE_WARNING_AS_ERROR=ON \
+          -D TDESKTOP_API_TEST=ON \
+          -D DESKTOP_APP_DISABLE_AUTOUPDATE=OFF \
+          -D DESKTOP_APP_DISABLE_CRASH_REPORTS=OFF \
+          $DEFINE
+
+      - name: Check.
+        if: env.ONLY_CACHE == 'false'
+        run: |
+          filePath="out/Debug/Telegram"
+          if test -f "$filePath"; then
+            echo "Build successfully done! :)"
+
+            size=$(stat -c %s "$filePath")
+            echo "File size of ${filePath}: ${size} Bytes."
+          else
+            echo "Build error, output file does not exist."
+            exit 1
+          fi
+
+      - name: Move artifact.
+        if: env.UPLOAD_ARTIFACT == 'true'
+        run: |
+          cd out/Debug
+          mkdir artifact
+          mv {Telegram,Updater} artifact/
+      - uses: actions/upload-artifact@v6
+        if: env.UPLOAD_ARTIFACT == 'true'
+        name: Upload artifact.
+        with:
+          name: ${{ env.ARTIFACT_NAME }}
+          path: out/Debug/artifact/

.github/workflows/lock.yml

@@ -0,0 +1,15 @@
+name: 'Lock Threads'
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  lock:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dessant/lock-threads@v6
+        with:
+          github-token: ${{ github.token }}
+          issue-inactive-days: 45
+          pr-inactive-days: 45

.github/workflows/mac.yml

@@ -0,0 +1,139 @@
+name: MacOS.
+
+on:
+  push:
+    paths-ignore:
+      - 'docs/**'
+      - '**.md'
+      - 'changelog.txt'
+      - 'LEGAL'
+      - 'LICENSE'
+      - '.github/**'
+      - '!.github/workflows/mac.yml'
+      - 'lib/xdg/**'
+      - 'snap/**'
+      - 'Telegram/build/docker/**'
+      - 'Telegram/Resources/uwp/**'
+      - 'Telegram/Resources/winrc/**'
+      - 'Telegram/SourceFiles/platform/win/**'
+      - 'Telegram/SourceFiles/platform/linux/**'
+      - 'Telegram/configure.bat'
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - '**.md'
+      - 'changelog.txt'
+      - 'LEGAL'
+      - 'LICENSE'
+      - '.github/**'
+      - '!.github/workflows/mac.yml'
+      - 'lib/xdg/**'
+      - 'snap/**'
+      - 'Telegram/build/docker/**'
+      - 'Telegram/Resources/uwp/**'
+      - 'Telegram/Resources/winrc/**'
+      - 'Telegram/SourceFiles/platform/win/**'
+      - 'Telegram/SourceFiles/platform/linux/**'
+      - 'Telegram/configure.bat'
+
+jobs:
+
+  macos:
+    name: MacOS
+    runs-on: macos-latest
+
+    strategy:
+      matrix:
+        defines:
+          - ""
+    env:
+      UPLOAD_ARTIFACT: "true"
+      ONLY_CACHE: "false"
+      PREPARE_PATH: "Telegram/build/prepare/prepare.py"
+
+    steps:
+      - name: Get repository name.
+        run: echo "REPO_NAME=${GITHUB_REPOSITORY##*/}" >> $GITHUB_ENV
+
+      - name: Clone.
+        uses: actions/checkout@v6
+        with:
+          submodules: recursive
+          path: ${{ env.REPO_NAME }}
+
+      - name: First set up.
+        run: |
+          sudo chown -R `whoami`:admin /usr/local/share
+
+          brew update
+          brew upgrade || true
+          brew install automake meson nasm ninja pkg-config
+
+          # Disable spotlight.
+          sudo mdutil -a -i off
+
+          sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
+
+          sudo sed -i '' '/CMAKE_${lang}_FLAGS_DEBUG_INIT/s/ -g//' /opt/homebrew/share/cmake/Modules/Compiler/GNU.cmake
+
+      - name: ThirdParty cache.
+        id: cache-third-party
+        uses: actions/cache@v5
+        with:
+          path: ThirdParty
+          key: ${{ runner.OS }}-third-party-${{ hashFiles(format('{0}/{1}', env.REPO_NAME, env.PREPARE_PATH)) }}
+          restore-keys: ${{ runner.OS }}-third-party-
+
+      - name: Libraries cache.
+        id: cache-libs
+        uses: actions/cache@v5
+        with:
+          path: Libraries
+          key: ${{ runner.OS }}-libs-${{ hashFiles(format('{0}/{1}', env.REPO_NAME, env.PREPARE_PATH)) }}
+          restore-keys: ${{ runner.OS }}-libs-
+
+      - name: Libraries.
+        run: |
+          ./$REPO_NAME/Telegram/build/prepare/mac.sh skip-release silent
+
+      - name: Free up some disk space.
+        run: find Libraries '(' '(' ! '(' -name '*.a' -o -name '*.h' -o -name '*.hpp' -o -name '*.inc' -o -name '*.cmake' -o -path '*/include/*' -o -path '*/objects-*' -o -path '*/cache_keys/*' -o -perm +111 ')' -type f ')' -o -empty ')' -delete
+
+      - name: Telegram Desktop build.
+        if: env.ONLY_CACHE == 'false'
+        run: |
+          cd $REPO_NAME/Telegram
+
+          DEFINE=""
+          if [ -n "${{ matrix.defines }}" ]; then
+            DEFINE="-D ${{ matrix.defines }}=ON"
+            echo Define from matrix: $DEFINE
+            echo "ARTIFACT_NAME=Telegram ${{ matrix.defines }}" >> $GITHUB_ENV
+          else
+            echo "ARTIFACT_NAME=Telegram" >> $GITHUB_ENV
+          fi
+
+          ./configure.sh \
+          -D CMAKE_CONFIGURATION_TYPES=Debug \
+          -D CMAKE_COMPILE_WARNING_AS_ERROR=ON \
+          -D CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_ALLOWED=NO \
+          -D TDESKTOP_API_TEST=ON \
+          -D DESKTOP_APP_DISABLE_AUTOUPDATE=OFF \
+          -D DESKTOP_APP_DISABLE_CRASH_REPORTS=OFF \
+          $DEFINE
+
+          cmake --build ../out --config Debug --parallel
+
+      - name: Move artifact.
+        if: env.UPLOAD_ARTIFACT == 'true'
+        run: |
+          cd $REPO_NAME/out/Debug
+          mkdir artifact
+          mv Telegram.app artifact/
+          mv Updater artifact/
+      - uses: actions/upload-artifact@v6
+        if: env.UPLOAD_ARTIFACT == 'true'
+        name: Upload artifact.
+        with:
+          name: ${{ env.ARTIFACT_NAME }}
+          path: ${{ env.REPO_NAME }}/out/Debug/artifact/

.github/workflows/mac_packaged.yml

@@ -0,0 +1,195 @@
+name: MacOS Packaged.
+
+on:
+  push:
+    paths-ignore:
+      - 'docs/**'
+      - '**.md'
+      - 'changelog.txt'
+      - 'LEGAL'
+      - 'LICENSE'
+      - '.github/**'
+      - '!.github/workflows/mac_packaged.yml'
+      - 'lib/xdg/**'
+      - 'snap/**'
+      - 'Telegram/build/**'
+      - 'Telegram/Resources/uwp/**'
+      - 'Telegram/Resources/winrc/**'
+      - 'Telegram/SourceFiles/platform/win/**'
+      - 'Telegram/SourceFiles/platform/linux/**'
+      - 'Telegram/configure.bat'
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - '**.md'
+      - 'changelog.txt'
+      - 'LEGAL'
+      - 'LICENSE'
+      - '.github/**'
+      - '!.github/workflows/mac_packaged.yml'
+      - 'lib/xdg/**'
+      - 'snap/**'
+      - 'Telegram/build/**'
+      - 'Telegram/Resources/uwp/**'
+      - 'Telegram/Resources/winrc/**'
+      - 'Telegram/SourceFiles/platform/win/**'
+      - 'Telegram/SourceFiles/platform/linux/**'
+      - 'Telegram/configure.bat'
+
+jobs:
+
+  macos:
+    name: MacOS
+    runs-on: macos-latest
+
+    strategy:
+      matrix:
+        defines:
+          - ""
+
+    env:
+      GIT: "https://github.com"
+      CMAKE_PREFIX_PATH: "/opt/homebrew/opt/ffmpeg@6:/opt/homebrew/opt/openal-soft"
+      UPLOAD_ARTIFACT: "true"
+      ONLY_CACHE: "false"
+      MANUAL_CACHING: "1"
+      AUTO_CACHING: "1"
+
+    steps:
+      - name: Get repository name.
+        run: echo "REPO_NAME=${GITHUB_REPOSITORY##*/}" >> $GITHUB_ENV
+
+      - name: Clone.
+        uses: actions/checkout@v6
+        with:
+          submodules: recursive
+          path: ${{ env.REPO_NAME }}
+
+      - name: First set up.
+        run: |
+          brew update
+          brew upgrade || true
+          brew install ada-url autoconf automake boost cmake ffmpeg@6 jpeg-xl libavif libheif libtool openal-soft openh264 openssl opus ninja pkg-config python qtbase qtimageformats qtsvg xz
+          sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
+
+          xcodebuild -version > CACHE_KEY.txt
+          brew list --versions >> CACHE_KEY.txt
+          echo $MANUAL_CACHING >> CACHE_KEY.txt
+          echo "$GITHUB_WORKSPACE" >> CACHE_KEY.txt
+          if [ "$AUTO_CACHING" = "1" ]; then
+            thisFile=$REPO_NAME/.github/workflows/mac_packaged.yml
+            echo `md5 -q $thisFile` >> CACHE_KEY.txt
+          fi
+          echo "CACHE_KEY=`md5 -q CACHE_KEY.txt`" >> $GITHUB_ENV
+
+          echo "MACOSX_DEPLOYMENT_TARGET=$(grep 'set(QT_SUPPORTED_MIN_MACOS_VERSION' /opt/homebrew/Cellar/qtbase/*/lib/cmake/Qt6/Qt6ConfigExtras.cmake | sed -E 's/^.*"(.*)"\)$/\1/')" >> $GITHUB_ENV
+          echo "LibrariesPath=`pwd`" >> $GITHUB_ENV
+
+          echo "WEBRTC=`curl -sSL --header 'Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}' https://api.github.com/repos/desktop-app/tg_owt/git/refs/heads/master | jq -r .object.sha`" >> $GITHUB_ENV
+
+      - name: RNNoise.
+        run: |
+          cd $LibrariesPath
+
+          git clone --depth=1 https://gitlab.xiph.org/xiph/rnnoise.git
+          cd rnnoise
+          ./autogen.sh
+          ./configure --disable-examples --disable-doc
+          make -j$(sysctl -n hw.logicalcpu)
+          sudo make install
+
+      - name: WebRTC cache.
+        id: cache-webrtc
+        uses: actions/cache@v5
+        with:
+          path: ${{ env.LibrariesPath }}/tg_owt
+          key: ${{ runner.OS }}-webrtc-${{ env.WEBRTC }}-${{ env.CACHE_KEY }}
+      - name: WebRTC.
+        if: steps.cache-webrtc.outputs.cache-hit != 'true'
+        run: |
+          cd $LibrariesPath
+
+          git clone --depth=1 --recursive --shallow-submodules $GIT/desktop-app/tg_owt.git
+          cd tg_owt
+
+          cmake -Bbuild -GNinja . \
+          -DCMAKE_BUILD_TYPE=Debug \
+          -DCMAKE_C_FLAGS_DEBUG="" \
+          -DCMAKE_CXX_FLAGS_DEBUG="" \
+          -DCMAKE_DISABLE_FIND_PACKAGE_absl=ON
+
+          cmake --build build --parallel
+
+      - name: TDE2E cache.
+        id: cache-tde2e
+        uses: actions/cache@v5
+        with:
+          path: ${{ env.LibrariesPath }}/tde2e
+          key: ${{ runner.OS }}-tde2e-${{ env.CACHE_KEY }}
+      - name: TDE2E.
+        if: steps.cache-tde2e.outputs.cache-hit != 'true'
+        run: |
+          cd $LibrariesPath
+
+          git init tde2e
+          cd tde2e
+          git remote add origin $GIT/tdlib/td.git
+          git fetch --depth=1 origin 51743dfd01dff6179e2d8f7095729caa4e2222e9
+          git reset --hard FETCH_HEAD
+
+          cmake -Bbuild -GNinja . \
+          -DCMAKE_BUILD_TYPE=Debug \
+          -DCMAKE_INSTALL_PREFIX=$PWD/build/prefix \
+          -DCMAKE_C_FLAGS_DEBUG="" \
+          -DCMAKE_CXX_FLAGS_DEBUG="" \
+          -DTD_E2E_ONLY=ON
+
+          cmake --build build --parallel
+          cmake --install build
+
+      - name: Telegram Desktop build.
+        if: env.ONLY_CACHE == 'false'
+        env:
+          tg_owt_DIR: ${{ env.LibrariesPath }}/tg_owt/build
+          tde2e_DIR: ${{ env.LibrariesPath }}/tde2e/build/prefix
+        run: |
+          cd $REPO_NAME
+
+          DEFINE=""
+          if [ -n "${{ matrix.defines }}" ]; then
+            DEFINE="-D ${{ matrix.defines }}=ON"
+            echo Define from matrix: $DEFINE
+            echo "ARTIFACT_NAME=Telegram ${{ matrix.defines }}" >> $GITHUB_ENV
+          else
+            echo "ARTIFACT_NAME=Telegram" >> $GITHUB_ENV
+          fi
+
+          cmake -Bbuild -GNinja . \
+          -DCMAKE_BUILD_TYPE=Debug \
+          -DCMAKE_C_FLAGS_DEBUG="" \
+          -DCMAKE_CXX_FLAGS_DEBUG="" \
+          -DTDESKTOP_API_TEST=ON \
+          $DEFINE
+
+          cmake --build build --parallel
+
+          cd build
+          macdeployqt Telegram.app
+          codesign --remove-signature Telegram.app
+
+          mkdir dmgsrc
+          mv Telegram.app dmgsrc
+          hdiutil create -volname Telegram -srcfolder dmgsrc -ov -format UDZO Telegram.dmg
+
+      - name: Move artifact.
+        if: env.UPLOAD_ARTIFACT == 'true'
+        run: |
+          cd $REPO_NAME/build
+          mkdir artifact
+          mv Telegram.dmg artifact/
+      - uses: actions/upload-artifact@v6
+        if: env.UPLOAD_ARTIFACT == 'true'
+        name: Upload artifact.
+        with:
+          name: ${{ env.ARTIFACT_NAME }}
+          path: ${{ env.REPO_NAME }}/build/artifact/

.github/workflows/master_updater.yml

@@ -0,0 +1,13 @@
+name: Master branch updater.
+
+on:
+  release:
+    types: released
+
+jobs:
+  User-agent:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: desktop-app/action_code_updater@master
+        with:
+          type: "dev-to-master"

.github/workflows/needs-user-action.yml

@@ -0,0 +1,16 @@
+name: Needs user action.
+
+on:
+  issue_comment:
+    types: [created]
+  schedule:
+    - cron: '0 2 * * *'
+
+jobs:
+  needs-user-action:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: lee-dohm/no-response@v0.5.0
+        with:
+          token: ${{ github.token }}
+          responseRequiredLabel: needs user action

.github/workflows/snap.yml

@@ -0,0 +1,87 @@
+name: Snap.
+
+on:
+  push:
+    paths-ignore:
+      - 'docs/**'
+      - '**.md'
+      - 'changelog.txt'
+      - 'LEGAL'
+      - 'LICENSE'
+      - '.github/**'
+      - '!.github/workflows/snap.yml'
+      - 'Telegram/build/**'
+      - 'Telegram/Resources/uwp/**'
+      - 'Telegram/Resources/winrc/**'
+      - 'Telegram/SourceFiles/platform/win/**'
+      - 'Telegram/SourceFiles/platform/mac/**'
+      - 'Telegram/Telegram/**'
+      - 'Telegram/configure.bat'
+      - 'Telegram/Telegram.plist'
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - '**.md'
+      - 'changelog.txt'
+      - 'LEGAL'
+      - 'LICENSE'
+      - '.github/**'
+      - '!.github/workflows/snap.yml'
+      - 'Telegram/build/**'
+      - 'Telegram/Resources/uwp/**'
+      - 'Telegram/Resources/winrc/**'
+      - 'Telegram/SourceFiles/platform/win/**'
+      - 'Telegram/SourceFiles/platform/mac/**'
+      - 'Telegram/Telegram/**'
+      - 'Telegram/configure.bat'
+      - 'Telegram/Telegram.plist'
+
+jobs:
+
+  snap:
+    name: Ubuntu
+    runs-on: ubuntu-latest
+
+    env:
+      UPLOAD_ARTIFACT: "true"
+
+    steps:
+      - name: Clone.
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+          submodules: recursive
+
+      - name: First set up.
+        run: |
+          sudo iptables -P FORWARD ACCEPT
+          sudo snap install --classic snapcraft
+          sudo usermod -aG lxd $USER
+          sudo lxd init --auto
+          sudo lxd waitready
+
+      - name: Free up some disk space.
+        uses: samueldr/more-space-action@97048bd0df83fb05b5257887bdbaffc848887673
+        with:
+          enable-remove-default-apt-patterns: false
+          enable-lvm-span: true
+          lvm-span-mountpoint: /var/snap/lxd/common/lxd/storage-pools/default/containers
+
+      - name: Telegram Desktop snap build.
+        run: sudo -u $USER snap run snapcraft --verbosity=debug
+
+      - name: Move artifact.
+        if: env.UPLOAD_ARTIFACT == 'true'
+        run: |
+          artifact_name=$(echo telegram-desktop_*.snap)
+          echo "ARTIFACT_NAME=$artifact_name" >> $GITHUB_ENV
+
+          mkdir artifact
+          mv $artifact_name artifact
+
+      - uses: actions/upload-artifact@v6
+        if: env.UPLOAD_ARTIFACT == 'true'
+        name: Upload artifact.
+        with:
+          name: ${{ env.ARTIFACT_NAME }}
+          path: artifact

.github/workflows/stale.yml

@@ -0,0 +1,25 @@
+name: 'Close stale issues and PRs'
+on:
+  schedule:
+    - cron: '30 1 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v10
+        with:
+          stale-issue-message: |
+            Hey there!
+
+            This issue was inactive for a long time and will be automatically closed in 30 days if there isn't any further activity. We therefore assume that the user has lost interest or resolved the problem on their own.
+
+            Don't worry though; if this is an error, let us know with a comment and we'll be happy to reopen the issue.
+
+            Thanks!
+          stale-issue-label: 'stale'
+          exempt-issue-labels: 'enhancement'
+          days-before-stale: 180
+          days-before-close: 30
+          days-before-pr-stale: -1
+          operations-per-run: 1000

.github/workflows/user_agent_updater.yml

@@ -0,0 +1,16 @@
+name: User-agent updater.
+
+on:
+  repository_dispatch:
+    types: ["Restart user_agent_updater workflow."]
+  schedule:
+    # At 00:00 on day-of-month 1.
+    - cron: "0 0 1 * *"
+
+jobs:
+  User-agent:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: desktop-app/action_code_updater@master
+        with:
+          type: "user-agent"

.github/workflows/waiting-for-answer.yml

@@ -0,0 +1,16 @@
+name: Waiting for answer.
+
+on:
+  issue_comment:
+    types: [created]
+  schedule:
+    - cron: '30 0 * * *'
+
+jobs:
+  waiting-for-answer:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: lee-dohm/no-response@v0.5.0
+        with:
+          token: ${{ github.token }}
+          responseRequiredLabel: waiting for answer

.github/workflows/win.yml

@@ -0,0 +1,210 @@
+name: Windows.
+
+on:
+  push:
+    paths-ignore:
+      - 'docs/**'
+      - '**.md'
+      - '!docs/building-win*.md'
+      - 'changelog.txt'
+      - 'LEGAL'
+      - 'LICENSE'
+      - '.github/**'
+      - '!.github/workflows/win.yml'
+      - 'lib/xdg/**'
+      - 'snap/**'
+      - 'Telegram/build/docker/**'
+      - 'Telegram/Resources/uwp/**'
+      - 'Telegram/SourceFiles/platform/linux/**'
+      - 'Telegram/SourceFiles/platform/mac/**'
+      - 'Telegram/Telegram/**'
+      - 'Telegram/configure.sh'
+      - 'Telegram/Telegram.plist'
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - '**.md'
+      - '!docs/building-win*.md'
+      - 'changelog.txt'
+      - 'LEGAL'
+      - 'LICENSE'
+      - '.github/**'
+      - '!.github/workflows/win.yml'
+      - 'lib/xdg/**'
+      - 'snap/**'
+      - 'Telegram/build/docker/**'
+      - 'Telegram/Resources/uwp/**'
+      - 'Telegram/SourceFiles/platform/linux/**'
+      - 'Telegram/SourceFiles/platform/mac/**'
+      - 'Telegram/Telegram/**'
+      - 'Telegram/configure.sh'
+      - 'Telegram/Telegram.plist'
+
+jobs:
+
+  windows:
+    name: Windows
+    runs-on: windows-latest
+
+    strategy:
+      matrix:
+        arch: [Win32, x64]
+        generator: ["", "Ninja Multi-Config"]
+
+    env:
+      UPLOAD_ARTIFACT: "true"
+      ONLY_CACHE: "false"
+      PREPARE_PATH: "Telegram/build/prepare/prepare.py"
+
+    defaults:
+      run:
+        shell: cmd
+
+    steps:
+      - name: Prepare directories.
+        run: |
+          mkdir %userprofile%\TBuild\Libraries
+          mklink /d %GITHUB_WORKSPACE%\TBuild %userprofile%\TBuild
+          echo TBUILD=%GITHUB_WORKSPACE%\TBuild>>%GITHUB_ENV%
+
+      - name: Get repository name.
+        shell: bash
+        run: echo "REPO_NAME=${GITHUB_REPOSITORY##*/}" >> $GITHUB_ENV
+
+      - name: Clone.
+        uses: actions/checkout@v6
+        with:
+          submodules: recursive
+          path: ${{ env.TBUILD }}\${{ env.REPO_NAME }}
+
+      - name: First set up.
+        shell: bash
+        run: |
+          DOCPATH=$TBUILD/$REPO_NAME/docs/building-win.md
+          [ "${{ matrix.arch }}" != Win32 ] && DOCPATH=$TBUILD/$REPO_NAME/docs/building-win-${{ matrix.arch }}.md
+          SDK="$(grep "SDK version" $DOCPATH | sed -r 's/.*\*\*(.*)\*\* SDK version.*/\1/')"
+          echo "SDK=$SDK" >> $GITHUB_ENV
+
+          sed -i '/CMAKE_${lang}_FLAGS_DEBUG_INIT/s/${_Zi}//' "$PROGRAMFILES"/CMake/share/cmake*/Modules/Platform/Windows-MSVC.cmake
+
+          echo "$(sha256sum $TBUILD/$REPO_NAME/$PREPARE_PATH | awk '{ print $1 }')" >> CACHE_KEY.txt
+          echo "$SDK" >> CACHE_KEY.txt
+          echo "CACHE_KEY=$(sha256sum CACHE_KEY.txt | awk '{ print $1 }')" >> $GITHUB_ENV
+
+          echo "Configurate git for cherry-picks."
+          git config --global user.email "you@example.com"
+          git config --global user.name "Sample"
+
+      - uses: ilammy/msvc-dev-cmd@v1.13.0
+        name: Native Tools Command Prompt.
+        with:
+          arch: ${{ matrix.arch }}
+          sdk: ${{ env.SDK }}
+
+      - name: NuGet sources.
+        run: |
+          nuget sources Disable -Name "Microsoft Visual Studio Offline Packages"
+          nuget sources Add -Source https://api.nuget.org/v3/index.json & exit 0
+
+      - name: ThirdParty cache.
+        id: cache-third-party
+        uses: actions/cache@v5
+        with:
+          path: ${{ env.TBUILD }}\ThirdParty
+          key: ${{ runner.OS }}-${{ matrix.arch }}-third-party-${{ env.CACHE_KEY }}
+          restore-keys: ${{ runner.OS }}-${{ matrix.arch }}-third-party-
+
+      - name: Libraries cache.
+        id: cache-libs
+        uses: actions/cache@v5
+        with:
+          path: ${{ env.TBUILD }}\Libraries
+          key: ${{ runner.OS }}-${{ matrix.arch }}-libs-${{ env.CACHE_KEY }}
+          restore-keys: ${{ runner.OS }}-${{ matrix.arch }}-libs-
+
+      - name: Libraries.
+        env:
+          GYP_MSVS_OVERRIDE_PATH: 'C:\Program Files\Microsoft Visual Studio\2022\Enterprise\'
+          GYP_MSVS_VERSION: 2022
+        run: |
+          cd %TBUILD%
+          %REPO_NAME%\Telegram\build\prepare\win.bat skip-release silent
+
+      - name: Read configuration matrix.
+        shell: bash
+        run: |
+          ARTIFACT_NAME="Telegram"
+
+          ARCH=""
+          if [ -n "${{ matrix.arch }}" ]; then
+            case "${{ matrix.arch }}" in
+              Win32) ARCH="x86";;
+              *) ARCH="${{ matrix.arch }}";;
+            esac
+            echo "Architecture from matrix: $ARCH"
+            ARTIFACT_NAME="${ARTIFACT_NAME} ${{ matrix.arch }}"
+          fi
+
+          GENERATOR=""
+          if [ -n "${{ matrix.generator }}" ]; then
+            GENERATOR="-G \"${{ matrix.generator }}\""
+            echo "Generator from matrix: $GENERATOR"
+            ARTIFACT_NAME="${ARTIFACT_NAME} ${{ matrix.generator }}"
+          fi
+          echo "TDESKTOP_BUILD_GENERATOR=$GENERATOR" >> $GITHUB_ENV
+
+          [ -n "$GENERATOR" ] && ARCH=""
+          echo "TDESKTOP_BUILD_ARCH=$ARCH" >> $GITHUB_ENV
+
+          DEFINE=""
+          if [ -n "${{ matrix.defines }}" ]; then
+            DEFINE="-D ${{ matrix.defines }}=ON"
+            echo "Define from matrix: $DEFINE"
+            ARTIFACT_NAME="${ARTIFACT_NAME} ${{ matrix.defines }}"
+          fi
+          echo "TDESKTOP_BUILD_DEFINE=$DEFINE" >> $GITHUB_ENV
+
+          echo "ARTIFACT_NAME=$ARTIFACT_NAME" >> $GITHUB_ENV
+
+          API="-D TDESKTOP_API_TEST=ON"
+          if [ $GITHUB_REF == 'refs/heads/nightly' ]; then
+            echo "Use the open credentials."
+            API="-D TDESKTOP_API_ID=611335 -D TDESKTOP_API_HASH=d524b414d21f4d37f08684c1df41ac9c"
+          fi
+          echo "TDESKTOP_BUILD_API=$API" >> $GITHUB_ENV
+
+      - name: Free up some disk space.
+        shell: bash
+        run: find TBuild/Libraries '(' '(' ! '(' -name '*.lib' -o -name '*.a' -o -name '*.exe' -o -name '*.h' -o -name '*.hpp' -o -name '*.inc' -o -name '*.cmake' -o -path '*/include/*'  -o -path '*/objects-*' -o -path '*/cache_keys/*' ')' -type f ')' -o -empty ')' -delete
+
+      - name: Telegram Desktop build.
+        if: env.ONLY_CACHE == 'false'
+        run: |
+          cd %TBUILD%\%REPO_NAME%\Telegram
+
+          call configure.bat ^
+          %TDESKTOP_BUILD_GENERATOR% ^
+          %TDESKTOP_BUILD_ARCH% ^
+          %TDESKTOP_BUILD_API% ^
+          -D CMAKE_CONFIGURATION_TYPES=Debug ^
+          -D CMAKE_COMPILE_WARNING_AS_ERROR=ON ^
+          -D CMAKE_MSVC_DEBUG_INFORMATION_FORMAT= ^
+          -D DESKTOP_APP_DISABLE_AUTOUPDATE=OFF ^
+          -D DESKTOP_APP_DISABLE_CRASH_REPORTS=OFF ^
+          %TDESKTOP_BUILD_DEFINE%
+
+          cmake --build ..\out --config Debug --parallel
+
+      - name: Move artifact.
+        if: (env.UPLOAD_ARTIFACT == 'true') || (github.ref == 'refs/heads/nightly')
+        run: |
+          set OUT=%TBUILD%\%REPO_NAME%\out\Debug
+          mkdir artifact
+          move %OUT%\Telegram.exe artifact/
+          move %OUT%\Updater.exe artifact/
+      - uses: actions/upload-artifact@v6
+        name: Upload artifact.
+        if: (env.UPLOAD_ARTIFACT == 'true') || (github.ref == 'refs/heads/nightly')
+        with:
+          name: ${{ env.ARTIFACT_NAME }}
+          path: artifact\

.github/workflows/winget.yml

@@ -0,0 +1,20 @@
+name: Publish to WinGet
+on:
+  release:
+    types: [released, prereleased]
+jobs:
+  publish:
+    runs-on: windows-latest # action can only be run on windows
+    steps:
+      - if: github.event.action == 'released'
+        uses: telegramdesktop/winget-releaser@main
+        with:
+          identifier: Telegram.TelegramDesktop
+          installers-regex: 't(setup|portable).*(exe|zip)$'
+          token: ${{ secrets.WINGET_TOKEN }}
+      - if: github.event.action == 'prereleased'
+        uses: telegramdesktop/winget-releaser@main
+        with:
+          identifier: Telegram.TelegramDesktop.Beta
+          installers-regex: 't(setup|portable).*(exe|zip)$'
+          token: ${{ secrets.WINGET_TOKEN }}

.gitignore

@@ -0,0 +1,66 @@
+/out/
+Debug/
+Release/
+/ThirdParty/
+/Telegram/build/target
+/Telegram/tests/
+/Telegram/gyp/tests/*.test
+/Telegram/out/
+/Telegram/*.user
+*.vcxproj*
+*.sln
+*.suo
+*.sdf
+*.opensdf
+*.opendb
+*.VC.db
+*.aps
+*.xcodeproj
+ipch/
+.vs/
+.vscode/
+.cache/
+compile_commands.json
+
+/Telegram/log.txt
+/Telegram/data
+/Telegram/data_config
+/Telegram/DebugLogs/
+/Telegram/tdata/
+/Telegram/tdumps/
+
+.DS_Store
+._*
+.qmake.stash
+/Mac/
+project.xcworkspace
+xcuserdata
+
+parts
+prime
+stage
+*.snap
+.snapcraft
+/snap/gui/*.png
+/snap/gui/*.desktop
+/snap/plugins/__pycache__
+
+/Telegram/*.user.*
+*.txt.user
+*.pro.user
+/Linux/
+/Telegram/Makefile
+*.*~
+.idea/
+cmake-build-debug/
+
+# Local configuration files
+settings.local.json
+*.local.json
+.env
+.env.local
+.env.*.local
+
+# Cursor IDE local settings (but keep .cursor/rules/)
+.cursor/*
+!.cursor/rules/

.gitmodules

@@ -0,0 +1,93 @@
+[submodule "Telegram/ThirdParty/GSL"]
+	path = Telegram/ThirdParty/GSL
+	url = https://github.com/Microsoft/GSL.git
+[submodule "Telegram/ThirdParty/xxHash"]
+	path = Telegram/ThirdParty/xxHash
+	url = https://github.com/Cyan4973/xxHash.git
+[submodule "Telegram/ThirdParty/rlottie"]
+	path = Telegram/ThirdParty/rlottie
+	url = https://github.com/desktop-app/rlottie.git
+[submodule "Telegram/ThirdParty/lz4"]
+	path = Telegram/ThirdParty/lz4
+	url = https://github.com/lz4/lz4.git
+[submodule "Telegram/lib_crl"]
+	path = Telegram/lib_crl
+	url = https://github.com/desktop-app/lib_crl.git
+[submodule "Telegram/lib_rpl"]
+	path = Telegram/lib_rpl
+	url = https://github.com/desktop-app/lib_rpl.git
+[submodule "Telegram/lib_base"]
+	path = Telegram/lib_base
+	url = https://github.com/desktop-app/lib_base.git
+[submodule "Telegram/codegen"]
+	path = Telegram/codegen
+	url = https://github.com/desktop-app/codegen.git
+[submodule "Telegram/lib_ui"]
+	path = Telegram/lib_ui
+	url = https://github.com/desktop-app/lib_ui.git
+[submodule "Telegram/lib_lottie"]
+	path = Telegram/lib_lottie
+	url = https://github.com/desktop-app/lib_lottie.git
+[submodule "Telegram/lib_tl"]
+	path = Telegram/lib_tl
+	url = https://github.com/desktop-app/lib_tl.git
+[submodule "Telegram/lib_spellcheck"]
+	path = Telegram/lib_spellcheck
+	url = https://github.com/desktop-app/lib_spellcheck
+[submodule "Telegram/lib_storage"]
+	path = Telegram/lib_storage
+	url = https://github.com/desktop-app/lib_storage.git
+[submodule "cmake"]
+	path = cmake
+	url = https://github.com/desktop-app/cmake_helpers.git
+[submodule "Telegram/ThirdParty/expected"]
+	path = Telegram/ThirdParty/expected
+	url = https://github.com/TartanLlama/expected
+[submodule "Telegram/ThirdParty/QR"]
+	path = Telegram/ThirdParty/QR
+	url = https://github.com/nayuki/QR-Code-generator
+[submodule "Telegram/lib_qr"]
+	path = Telegram/lib_qr
+	url = https://github.com/desktop-app/lib_qr.git
+[submodule "Telegram/ThirdParty/hunspell"]
+	path = Telegram/ThirdParty/hunspell
+	url = https://github.com/hunspell/hunspell
+[submodule "Telegram/ThirdParty/range-v3"]
+	path = Telegram/ThirdParty/range-v3
+	url = https://github.com/ericniebler/range-v3.git
+[submodule "Telegram/ThirdParty/nimf"]
+	path = Telegram/ThirdParty/nimf
+	url = https://github.com/hamonikr/nimf.git
+[submodule "Telegram/ThirdParty/hime"]
+	path = Telegram/ThirdParty/hime
+	url = https://github.com/hime-ime/hime.git
+[submodule "Telegram/ThirdParty/fcitx5-qt"]
+	path = Telegram/ThirdParty/fcitx5-qt
+	url = https://github.com/fcitx/fcitx5-qt.git
+[submodule "Telegram/lib_webrtc"]
+	path = Telegram/lib_webrtc
+	url = https://github.com/desktop-app/lib_webrtc.git
+[submodule "Telegram/ThirdParty/tgcalls"]
+	path = Telegram/ThirdParty/tgcalls
+	url = https://github.com/TelegramMessenger/tgcalls.git
+[submodule "Telegram/lib_webview"]
+	path = Telegram/lib_webview
+	url = https://github.com/desktop-app/lib_webview.git
+[submodule "Telegram/ThirdParty/dispatch"]
+	path = Telegram/ThirdParty/dispatch
+	url = https://github.com/apple/swift-corelibs-libdispatch
+[submodule "Telegram/ThirdParty/kimageformats"]
+	path = Telegram/ThirdParty/kimageformats
+	url = https://github.com/KDE/kimageformats.git
+[submodule "Telegram/ThirdParty/kcoreaddons"]
+	path = Telegram/ThirdParty/kcoreaddons
+	url = https://github.com/KDE/kcoreaddons.git
+[submodule "Telegram/ThirdParty/cld3"]
+	path = Telegram/ThirdParty/cld3
+	url = https://github.com/google/cld3.git
+[submodule "Telegram/ThirdParty/libprisma"]
+	path = Telegram/ThirdParty/libprisma
+	url = https://github.com/desktop-app/libprisma.git
+[submodule "Telegram/ThirdParty/xdg-desktop-portal"]
+	path = Telegram/ThirdParty/xdg-desktop-portal
+	url = https://github.com/flatpak/xdg-desktop-portal.git

CMakeLists.txt

@@ -0,0 +1,56 @@
+# This file is part of Telegram Desktop,
+# the official desktop application for the Telegram messaging service.
+#
+# For license and copyright information please follow this link:
+# https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+
+cmake_minimum_required(VERSION 3.25...3.31)
+
+set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+
+include(cmake/validate_special_target.cmake)
+include(cmake/version.cmake)
+desktop_app_parse_version(Telegram/build/version)
+
+project(Telegram
+    LANGUAGES C CXX
+    VERSION ${desktop_app_version_cmake}
+    DESCRIPTION "Official Telegram Desktop messenger"
+    HOMEPAGE_URL "https://desktop.telegram.org"
+)
+
+if (APPLE)
+    enable_language(OBJC OBJCXX)
+endif()
+
+set_property(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY VS_STARTUP_PROJECT Telegram)
+
+get_filename_component(third_party_loc "Telegram/ThirdParty" REALPATH)
+get_filename_component(submodules_loc "Telegram" REALPATH)
+get_filename_component(cmake_helpers_loc "cmake" REALPATH)
+
+if (NOT DESKTOP_APP_USE_PACKAGED AND WIN32)
+    set(Python3_EXECUTABLE ${CMAKE_CURRENT_SOURCE_DIR}/../ThirdParty/python/Scripts/python)
+endif()
+
+include(cmake/variables.cmake)
+include(cmake/nice_target_sources.cmake)
+include(cmake/target_compile_options_if_exists.cmake)
+include(cmake/target_link_frameworks.cmake)
+include(cmake/target_link_options_if_exists.cmake)
+include(cmake/init_target.cmake)
+include(cmake/generate_target.cmake)
+include(cmake/nuget.cmake)
+include(cmake/validate_d3d_compiler.cmake)
+include(cmake/target_prepare_qrc.cmake)
+
+include(cmake/options.cmake)
+include(cmake/external/qt/package.cmake)
+
+set(desktop_app_skip_libs
+    glibmm
+    variant
+)
+
+add_subdirectory(cmake)
+add_subdirectory(Telegram)

LEGAL

@@ -0,0 +1,21 @@
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+Copyright (c) 2014-2025 The Telegram Desktop Authors.
+
+Telegram Desktop is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+It is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+In addition, as a special exception, the copyright holders give permission
+to link the code of portions of this program with the OpenSSL library.
+
+More information about the Telegram project: https://telegram.org
+
+Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE

LICENSE

@@ -0,0 +1,688 @@
+Telegram Desktop is licensed under the GNU General Public License
+version 3 with the addition of the following special exception:
+
+In addition, as a special exception, the copyright holders give
+permission to link the code of portions of this program with the OpenSSL
+library.
+
+You must obey the GNU General Public License in all respects for all of
+the code used other than OpenSSL. If you modify file(s) with this
+exception, you may extend this exception to your version of the file(s),
+but you are not obligated to do so. If you do not wish to do so, delete
+this exception statement from your version. If you delete this exception
+statement from all source files in the program, then also delete it here.
+
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities.  However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
+
+  Conveying under any other circumstances is permitted solely under
+the conditions stated below.  Sublicensing is not allowed; section 10
+makes it unnecessary.
+
+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
+technological measures.
+
+  4. Conveying Verbatim Copies.
+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+  5. Conveying Modified Source Versions.
+
+  You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
+
+    a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+
+    b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under section
+    7.  This requirement modifies the requirement in section 4 to
+    "keep intact all notices".
+
+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged.  This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+
+    d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
+
+  A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
+in or on a volume of a storage or distribution medium, is called an
+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit.  Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+  6. Conveying Non-Source Forms.
+
+  You may convey a covered work in object code form under the terms
+of sections 4 and 5, provided that you also convey the
+machine-readable Corresponding Source under the terms of this License,
+in one of these ways:
+
+    a) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by the
+    Corresponding Source fixed on a durable physical medium
+    customarily used for software interchange.
+
+    b) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by a
+    written offer, valid for at least three years and valid for as
+    long as you offer spare parts or customer support for that product
+    model, to give anyone who possesses the object code either (1) a
+    copy of the Corresponding Source for all the software in the
+    product that is covered by this License, on a durable physical
+    medium customarily used for software interchange, for a price no
+    more than your reasonable cost of physically performing this
+    conveying of source, or (2) access to copy the
+    Corresponding Source from a network server at no charge.
+
+    c) Convey individual copies of the object code with a copy of the
+    written offer to provide the Corresponding Source.  This
+    alternative is allowed only occasionally and noncommercially, and
+    only if you received the object code with such an offer, in accord
+    with subsection 6b.
+
+    d) Convey the object code by offering access from a designated
+    place (gratis or for a charge), and offer equivalent access to the
+    Corresponding Source in the same way through the same place at no
+    further charge.  You need not require recipients to copy the
+    Corresponding Source along with the object code.  If the place to
+    copy the object code is a network server, the Corresponding Source
+    may be on a different server (operated by you or a third party)
+    that supports equivalent copying facilities, provided you maintain
+    clear directions next to the object code saying where to find the
+    Corresponding Source.  Regardless of what server hosts the
+    Corresponding Source, you remain obligated to ensure that it is
+    available for as long as needed to satisfy these requirements.
+
+    e) Convey the object code using peer-to-peer transmission, provided
+    you inform other peers where the object code and Corresponding
+    Source of the work are being offered to the general public at no
+    charge under subsection 6d.
+
+  A separable portion of the object code, whose source code is excluded
+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
+
+  A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal, family,
+or household purposes, or (2) anything designed or sold for incorporation
+into a dwelling.  In determining whether a product is a consumer product,
+doubtful cases shall be resolved in favor of coverage.  For a particular
+product received by a particular user, "normally used" refers to a
+typical or common use of that class of product, regardless of the status
+of the particular user or of the way in which the particular user
+actually uses, or expects or is expected to use, the product.  A product
+is a consumer product regardless of whether the product has substantial
+commercial, industrial or non-consumer uses, unless such uses represent
+the only significant mode of use of the product.
+
+  "Installation Information" for a User Product means any methods,
+procedures, authorization keys, or other information required to install
+and execute modified versions of a covered work in that User Product from
+a modified version of its Corresponding Source.  The information must
+suffice to ensure that the continued functioning of the modified object
+code is in no case prevented or interfered with solely because
+modification has been made.
+
+  If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information.  But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+  The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or updates
+for a work that has been modified or installed by the recipient, or for
+the User Product in which it has been modified or installed.  Access to a
+network may be denied when the modification itself materially and
+adversely affects the operation of the network or violates the rules and
+protocols for communication across the network.
+
+  Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.)  You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
+    a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+
+    b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in
+    reasonable ways as different from the original version; or
+
+    d) Limiting the use for publicity purposes of names of licensors or
+    authors of the material; or
+
+    e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
+    it) with contractual assumptions of liability to the recipient, for
+    any liability that these contractual assumptions directly impose on
+    those licensors and authors.
+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    {one line to give the program's name and a brief idea of what it does.}
+    Copyright (C) {year}  {name of author}
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    {project}  Copyright (C) {year}  {fullname}
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

Makefile

@@ -0,0 +1,32 @@
+.PHONY: build
+
+run: reset
+	$(PWD)/out/Debug/Telegram
+
+prepare:
+	git submodule update --init --recursive
+	$(PWD)/Telegram/build/prepare/linux.sh
+
+reset:
+	rm -rf ~/.local/share/TelegramDesktop
+	rm -rf $(PWD)/out/Debug/DebugLogs
+	rm -rf $(PWD)/out/Debug/tdata
+
+build: reset prepare
+	docker run --rm -it \
+    	-u 1000 \
+    	-v "$(PWD):/usr/src/tdesktop" \
+    	tdesktop:centos_env \
+    	/usr/src/tdesktop/Telegram/build/docker/centos_env/build.sh \
+    	-D TDESKTOP_API_ID=1234567 \
+    	-D TDESKTOP_API_HASH=0123456789abcdef0123456789abcdef
+
+debug: reset prepare
+	docker run --rm -it \
+    	-u 1000 \
+    	-v "$(PWD):/usr/src/tdesktop" \
+    	-e CONFIG=Debug \
+    	tdesktop:centos_env \
+    	/usr/src/tdesktop/Telegram/build/docker/centos_env/build.sh \
+    	-D TDESKTOP_API_ID=1234567 \
+    	-D TDESKTOP_API_HASH=0123456789abcdef0123456789abcde

README.md

@@ -0,0 +1,86 @@
+# [Telegram Desktop][telegram_desktop] – Official Messenger
+
+This is the complete source code and the build instructions for the official [Telegram][telegram] messenger desktop client, based on the [Telegram API][telegram_api] and the [MTProto][telegram_proto] secure protocol.
+
+[![Version](https://badge.fury.io/gh/telegramdesktop%2Ftdesktop.svg)](https://github.com/telegramdesktop/tdesktop/releases)
+[![Build Status](https://github.com/telegramdesktop/tdesktop/workflows/Windows./badge.svg)](https://github.com/telegramdesktop/tdesktop/actions)
+[![Build Status](https://github.com/telegramdesktop/tdesktop/workflows/MacOS./badge.svg)](https://github.com/telegramdesktop/tdesktop/actions)
+[![Build Status](https://github.com/telegramdesktop/tdesktop/workflows/Linux./badge.svg)](https://github.com/telegramdesktop/tdesktop/actions)
+
+[![Preview of Telegram Desktop][preview_image]][preview_image_url]
+
+The source code is published under GPLv3 with OpenSSL exception, the license is available [here][license].
+
+## Supported systems
+
+The latest version is available for
+
+* [Windows 7 and above (64 bit)](https://telegram.org/dl/desktop/win64) ([portable](https://telegram.org/dl/desktop/win64_portable))
+* [Windows 7 and above (32 bit)](https://telegram.org/dl/desktop/win) ([portable](https://telegram.org/dl/desktop/win_portable))
+* [macOS 10.13 and above](https://telegram.org/dl/desktop/mac)
+* [Linux static build for 64 bit](https://telegram.org/dl/desktop/linux)
+* [Snap](https://snapcraft.io/telegram-desktop)
+* [Flatpak](https://flathub.org/apps/details/org.telegram.desktop)
+
+## Old system versions
+
+Version **4.9.9** was the last that supports older systems
+
+* [macOS 10.12](https://updates.tdesktop.com/tmac/tsetup.4.9.9.dmg)
+* [Linux with glibc < 2.28 static build](https://updates.tdesktop.com/tlinux/tsetup.4.9.9.tar.xz)
+
+Version **2.4.4** was the last that supports older systems
+
+* [OS X 10.10 and 10.11](https://updates.tdesktop.com/tosx/tsetup-osx.2.4.4.dmg)
+* [Linux static build for 32 bit](https://updates.tdesktop.com/tlinux32/tsetup32.2.4.4.tar.xz)
+
+Version **1.8.15** was the last that supports older systems
+
+* [Windows XP and Vista](https://updates.tdesktop.com/tsetup/tsetup.1.8.15.exe) ([portable](https://updates.tdesktop.com/tsetup/tportable.1.8.15.zip))
+* [OS X 10.8 and 10.9](https://updates.tdesktop.com/tmac/tsetup.1.8.15.dmg)
+* [OS X 10.6 and 10.7](https://updates.tdesktop.com/tmac32/tsetup32.1.8.15.dmg)
+
+## Third-party
+
+* Qt 6 ([LGPL](http://doc.qt.io/qt-6/lgpl.html)) and Qt 5.15 ([LGPL](http://doc.qt.io/qt-5/lgpl.html)) slightly patched
+* OpenSSL 3.2.1 ([Apache License 2.0](https://www.openssl.org/source/apache-license-2.0.txt))
+* WebRTC ([New BSD License](https://github.com/desktop-app/tg_owt/blob/master/LICENSE))
+* zlib ([zlib License](http://www.zlib.net/zlib_license.html))
+* LZMA SDK 9.20 ([public domain](http://www.7-zip.org/sdk.html))
+* liblzma ([public domain](http://tukaani.org/xz/))
+* Google Breakpad ([License](https://chromium.googlesource.com/breakpad/breakpad/+/master/LICENSE))
+* Google Crashpad ([Apache License 2.0](https://chromium.googlesource.com/crashpad/crashpad/+/master/LICENSE))
+* GYP ([BSD License](https://github.com/bnoordhuis/gyp/blob/master/LICENSE))
+* Ninja ([Apache License 2.0](https://github.com/ninja-build/ninja/blob/master/COPYING))
+* OpenAL Soft ([LGPL](https://github.com/kcat/openal-soft/blob/master/COPYING))
+* Opus codec ([BSD License](http://www.opus-codec.org/license/))
+* FFmpeg ([LGPL](https://www.ffmpeg.org/legal.html))
+* Guideline Support Library ([MIT License](https://github.com/Microsoft/GSL/blob/master/LICENSE))
+* Range-v3 ([Boost License](https://github.com/ericniebler/range-v3/blob/master/LICENSE.txt))
+* Open Sans font ([Apache License 2.0](http://www.apache.org/licenses/LICENSE-2.0.html))
+* Vazirmatn font ([SIL Open Font License 1.1](https://github.com/rastikerdar/vazirmatn/blob/master/OFL.txt))
+* Emoji alpha codes ([MIT License](https://github.com/emojione/emojione/blob/master/extras/alpha-codes/LICENSE.md))
+* xxHash ([BSD License](https://github.com/Cyan4973/xxHash/blob/dev/LICENSE))
+* QR Code generator ([MIT License](https://github.com/nayuki/QR-Code-generator#license))
+* CMake ([New BSD License](https://github.com/Kitware/CMake/blob/master/Copyright.txt))
+* Hunspell ([LGPL](https://github.com/hunspell/hunspell/blob/master/COPYING.LESSER))
+* Ada ([Apache License 2.0](https://github.com/ada-url/ada/blob/main/LICENSE-APACHE))
+
+## Build instructions
+
+* Windows [(32-bit)][win32] [(64-bit)][win64]
+* [macOS][mac]
+* [GNU/Linux using Docker][linux]
+
+[//]: # (LINKS)
+[telegram]: https://telegram.org
+[telegram_desktop]: https://desktop.telegram.org
+[telegram_api]: https://core.telegram.org
+[telegram_proto]: https://core.telegram.org/mtproto
+[license]: LICENSE
+[win32]: docs/building-win.md
+[win64]: docs/building-win-x64.md
+[mac]: docs/building-mac.md
+[linux]: docs/building-linux.md
+[preview_image]: https://github.com/telegramdesktop/tdesktop/blob/dev/docs/assets/preview.png "Preview of Telegram Desktop"
+[preview_image_url]: https://raw.githubusercontent.com/telegramdesktop/tdesktop/dev/docs/assets/preview.png