Fixed keyboard / input issues with resizing.

ptlinux/gamebox_runtime.py

@@ -48,6 +48,7 @@ _NET_WM_STATE_REMOVE = 0
 _NET_WM_STATE_SOURCE_APPLICATION = 1
 _NET_WM_BYPASS_COMPOSITOR_PREFER_COMPOSITING = 2
 WINDOW_FOCUS_REPAIR_INTERVAL_SECONDS = 1.0
+GAMESCOPE_FOCUS_REPAIR_INTERVAL_SECONDS = 0.25
 _P_MIN_SIZE = 1 << 4
 _P_MAX_SIZE = 1 << 5
 _P_RESIZE_INC = 1 << 6
@@ -1556,6 +1557,28 @@ def _maintain_game_window_focus(
 	return int(process.wait())
 
 
+def _maintain_gamescope_game_window_focus(
+	mapper: _X11,
+	process: subprocess.Popen[bytes],
+	window: int,
+) -> int:
+	"""Restore nested keyboard focus after host resize/maximize operations."""
+
+	next_focus_repair_at = (
+		time.monotonic() + GAMESCOPE_FOCUS_REPAIR_INTERVAL_SECONDS
+	)
+	while process.poll() is None:
+		time.sleep(GAMESCOPE_FOCUS_REPAIR_INTERVAL_SECONDS)
+		now = time.monotonic()
+		if now < next_focus_repair_at:
+			continue
+		_repair_game_window_focus(mapper, window)
+		next_focus_repair_at = (
+			time.monotonic() + GAMESCOPE_FOCUS_REPAIR_INTERVAL_SECONDS
+		)
+	return int(process.wait())
+
+
 def _guard_game_window_startup(
 	mapper: _X11,
 	process: subprocess.Popen[bytes],
@@ -1732,7 +1755,11 @@ def run_game_window(
 						file=sys.stderr,
 						flush=True,
 					)
-					return int(process.wait())
+					return _maintain_gamescope_game_window_focus(
+						mapper,
+						process,
+						game_window,
+					)
 				_prepare_game_window(
 					mapper,
 					game_window,