Auto merge of #21881 - pyfisch:keyboard-types, r=paulrouget

Use keyboard-types crate

Have embedders send DOM keys to servo and use a strongly typed KeyboardEvent
from the W3C UI Events spec. All keyboard handling now uses the new types.

Introduce a ShortcutMatcher to recognize key bindings. Shortcuts are now
recognized in a uniform way.

Updated the winit port.
Updated webdriver integration.

part of #20331

What this PR does:

* allow the use non-ASCII keyboards for text input
* decouple keyboard event "key" from "code" (key meaning vs location)

What this PR does not do:

* completely improve keyboard events send from winit and webdriver
* add support for CompositionEvent or IME

Notes:

* The winit embedder does not send keyup events for printable keys (this is a regression)
* keyboard-types is on crates.io because I believe it to be useful outside of servo. If you prefer I can add a copy in this repo.

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components/compositing/Cargo.toml

@@ -21,6 +21,7 @@ gleam = {version = "0.6", optional = true}
 image = "0.19"
 ipc-channel = "0.11"
 libc = "0.2"
+keyboard-types = {version = "0.4.2-servo", features = ["serde"]}
 log = "0.4"
 msg = {path = "../msg"}
 net_traits = {path = "../net_traits"}

components/compositing/lib.rs

@@ -12,6 +12,7 @@ extern crate gleam;
 #[cfg(feature = "gleam")]
 extern crate image;
 extern crate ipc_channel;
+extern crate keyboard_types;
 extern crate libc;
 #[macro_use]
 extern crate log;

components/compositing/windowing.rs

@@ -8,7 +8,8 @@ use embedder_traits::EventLoopWaker;
 use euclid::TypedScale;
 #[cfg(feature = "gleam")]
 use gleam::gl;
-use msg::constellation_msg::{Key, KeyModifiers, KeyState, TopLevelBrowsingContextId, TraversalDirection};
+use keyboard_types::KeyboardEvent;
+use msg::constellation_msg::{TopLevelBrowsingContextId, TraversalDirection};
 use script_traits::{MouseButton, TouchEventType, TouchId};
 use servo_geometry::{DeviceIndependentPixel, DeviceUintLength};
 use servo_url::ServoUrl;
@@ -70,7 +71,7 @@ pub enum WindowEvent {
     /// Sent when the user quits the application
     Quit,
     /// Sent when a key input state changes
-    KeyEvent(Option<char>, Key, KeyState, KeyModifiers),
+    Keyboard(KeyboardEvent),
     /// Sent when Ctr+R/Apple+R is called to reload the current page.
     Reload(TopLevelBrowsingContextId),
     /// Create a new top level browsing context
@@ -94,7 +95,7 @@ impl Debug for WindowEvent {
             WindowEvent::Idle => write!(f, "Idle"),
             WindowEvent::Refresh => write!(f, "Refresh"),
             WindowEvent::Resize => write!(f, "Resize"),
-            WindowEvent::KeyEvent(..) => write!(f, "Key"),
+            WindowEvent::Keyboard(..) => write!(f, "Keyboard"),
             WindowEvent::LoadUrl(..) => write!(f, "LoadUrl"),
             WindowEvent::MouseWindowEventClass(..) => write!(f, "Mouse"),
             WindowEvent::MouseWindowMoveEventClass(..) => write!(f, "MouseMove"),