feat(debugger): flash the taskbar when a breakpoint is hit in an unfocused window (#1810)

A breakpoint stop now grabs attention like IDEA's: the owning window's
taskbar button flashes while the window is in the background (new
window_flash_taskbar command wrapping request_user_attention, which never
flashes a focused window), and the flash is stopped when the window is
focused, the paused thread resumes, or the session ends. A window running
with Focus application on breakpoint still focuses instead of flashing,
and repeated hits while already flashing do not re-request attention.

Closes #1742

Signed-off-by: Inf1mum <[email protected]>

src/bindings.ts

@@ -863,6 +863,13 @@ export const commands = {
 	/**  Focuses the next / previous window (⌘` / ⇧⌘`). */
 	windowCycle: (forward: boolean) => __TAURI_INVOKE<void>("window_cycle", { forward }),
 	windowToggleFullscreen: () => typedError<boolean, IdeError>(__TAURI_INVOKE("window_toggle_fullscreen")),
+	/**
+	 *  Flash (`true`) or stop flashing (`false`) this window's taskbar button, like IDEA when a
+	 *  breakpoint is hit while the window is in the background (macOS bounces the dock icon,
+	 *  Linux sets the urgency hint). A focused window is never flashed: the user is already
+	 *  looking at it, and re-flashing it would steal attention for nothing.
+	 */
+	windowFlashTaskbar: (flash: boolean) => typedError<null, IdeError>(__TAURI_INVOKE("window_flash_taskbar", { flash })),
 	/**  Height of the web title bar in native logical pixels (CSS height × IDE zoom). */
 	windowSetTitlebarHeight: (height: number | null) => typedError<null, IdeError>(__TAURI_INVOKE("window_set_titlebar_height", { height })),
 	/**