27591 Add a unit test for FlutterFrameBufferProvider (cla: yes, platform-macos)

27732 macOS: Do not use dispatch queue when canceling idle callback (cla: yes, platform-macos, needs tests)

27817 Do not generate keydown event for empty modifier flags (cla: yes, platform-macos)

27828 Fix race condition in FlutterSurfaceManager (cla: yes, waiting for tree to go green, platform-macos, needs tests)

platform-windows - 34 pull request(s)

23467 Hardware Keyboard: Linux (GTK) (affects: text input, cla: yes, platform-macos, platform-linux, platform-windows, embedder)

25412 Windows: Add support for engine switches for WinUWP target (cla: yes, waiting for tree to go green, platform-windows)