wayland: Window controls and drag (#11525)

Based on https://github.com/zed-industries/zed/pull/11046

- Partially fixes #10346 
- Fixes https://github.com/zed-industries/zed/issues/9964

## Features
Window buttons

![image](https://github.com/zed-industries/zed/assets/71973804/1b7e0504-3925-45ba-90b5-5adb55e0d739)

Window drag

![image](https://github.com/zed-industries/zed/assets/71973804/9c509a37-e5a5-484c-9f80-c722aeee4380)

Native window context menu

![image](https://github.com/zed-industries/zed/assets/71973804/048ecf52-e277-49bb-a106-91cad226fd8a)

### Limitations

- No resizing
- Wayland only (though X11 always has window decorations)

### Technical

This PR adds three APIs to gpui.

1. `show_window_menu`: Triggers the native title bar context menu.
2. `start_system_move`: Tells the compositor to start dragging the
window.
3. `should_render_window_controls`: Whether the compositor doesn't
support server side decorations.

These APIs have only been implemented for Wayland, but they should be
portable to other platforms.

Release Notes:

- N/A

---------

Co-authored-by: Akilan Elango <akilan1997@gmail.com>

crates/gpui/src/platform/linux/wayland/window.rs

@@ -23,12 +23,13 @@ use wayland_protocols_plasma::blur::client::{org_kde_kwin_blur, org_kde_kwin_blu
 
 use crate::platform::blade::{BladeRenderer, BladeSurfaceConfig};
 use crate::platform::linux::wayland::display::WaylandDisplay;
+use crate::platform::linux::wayland::serial::SerialKind;
 use crate::platform::{PlatformAtlas, PlatformInputHandler, PlatformWindow};
 use crate::scene::Scene;
 use crate::{
     px, size, Bounds, DevicePixels, Globals, Modifiers, Pixels, PlatformDisplay, PlatformInput,
-    Point, PromptLevel, Size, WaylandClientState, WaylandClientStatePtr, WindowAppearance,
-    WindowBackgroundAppearance, WindowBounds, WindowParams,
+    Point, PromptLevel, Size, WaylandClientStatePtr, WindowAppearance, WindowBackgroundAppearance,
+    WindowBounds, WindowParams,
 };
 
 #[derive(Default)]
@@ -753,6 +754,27 @@ impl PlatformWindow for WaylandWindow {
         let state = self.borrow();
         state.renderer.sprite_atlas().clone()
     }
+
+    fn show_window_menu(&self, position: Point<Pixels>) {
+        let state = self.borrow();
+        let serial = state.client.get_serial(SerialKind::MousePress);
+        state.toplevel.show_window_menu(
+            &state.globals.seat,
+            serial,
+            position.x.0 as i32,
+            position.y.0 as i32,
+        );
+    }
+
+    fn start_system_move(&self) {
+        let state = self.borrow();
+        let serial = state.client.get_serial(SerialKind::MousePress);
+        state.toplevel._move(&state.globals.seat, serial);
+    }
+
+    fn should_render_window_controls(&self) -> bool {
+        self.borrow().decoration_state == WaylandDecorationState::Client
+    }
 }
 
 #[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]