[fix] keep stream menus open while suspending remote input

apps/desktop/src/gui/features/input/stream_keyboard_focus.h

@@ -0,0 +1,26 @@
+/*
+ * @Author: DI JUNKUN
+ * @Date: 2026-11-11
+ * Copyright (c) 2026 by DI JUNKUN, All Rights Reserved.
+ */
+
+#ifndef _STREAM_KEYBOARD_FOCUS_H_
+#define _STREAM_KEYBOARD_FOCUS_H_
+
+namespace crossdesk {
+
+// Native window focus and ownership of keyboard input are different: a local
+// menu keeps the window active while temporarily suspending remote input.
+// Publish the new state before releasing input, since UI callbacks can reenter.
+template <typename Release>
+void UpdateStreamKeyboardFocus(bool focused, bool local_input_active,
+                               bool& remote_focused, Release release) {
+  focused = focused && !local_input_active;
+  if (remote_focused == focused) return;
+  remote_focused = focused;
+  if (!focused) release(local_input_active);
+}
+
+}  // namespace crossdesk
+
+#endif