[X11] Fix Godot stealing focus on alternative Window Managers

platform/linuxbsd/x11/display_server_x11.cpp

@@ -2010,7 +2010,7 @@ void DisplayServerX11::window_set_transient(WindowID p_window, WindowID p_parent
 		// RevertToPointerRoot is used to make sure we don't lose all focus in case
 		// a subwindow and its parent are both destroyed.
 		if (!wd_window.no_focus && !wd_window.is_popup && wd_window.focused) {
-			if ((xwa.map_state == IsViewable) && !wd_parent.no_focus && !wd_window.is_popup) {
+			if ((xwa.map_state == IsViewable) && !wd_parent.no_focus && !wd_window.is_popup && _window_focus_check()) {
 				XSetInputFocus(x11_display, wd_parent.x11_window, RevertToPointerRoot, CurrentTime);
 			}
 		}
@@ -2945,7 +2945,7 @@ void DisplayServerX11::window_set_ime_active(const bool p_active, WindowID p_win
 		XWindowAttributes xwa;
 		XSync(x11_display, False);
 		XGetWindowAttributes(x11_display, wd.x11_xim_window, &xwa);
-		if (xwa.map_state == IsViewable) {
+		if (xwa.map_state == IsViewable && _window_focus_check()) {
 			XSetInputFocus(x11_display, wd.x11_xim_window, RevertToParent, CurrentTime);
 		}
 		XSetICFocus(wd.xic);
@@ -4228,6 +4228,22 @@ bool DisplayServerX11::mouse_process_popups() {
 	return closed;
 }
 
+bool DisplayServerX11::_window_focus_check() {
+	Window focused_window;
+	int focus_ret_state;
+	XGetInputFocus(x11_display, &focused_window, &focus_ret_state);
+
+	bool has_focus = false;
+	for (const KeyValue<int, DisplayServerX11::WindowData> &wid : windows) {
+		if (wid.value.x11_window == focused_window) {
+			has_focus = true;
+			break;
+		}
+	}
+
+	return has_focus;
+}
+
 void DisplayServerX11::process_events() {
 	_THREAD_SAFE_METHOD_
 
@@ -4499,7 +4515,7 @@ void DisplayServerX11::process_events() {
 				// Set focus when menu window is started.
 				// RevertToPointerRoot is used to make sure we don't lose all focus in case
 				// a subwindow and its parent are both destroyed.
-				if ((xwa.map_state == IsViewable) && !wd.no_focus && !wd.is_popup) {
+				if ((xwa.map_state == IsViewable) && !wd.no_focus && !wd.is_popup && _window_focus_check()) {
 					XSetInputFocus(x11_display, wd.x11_window, RevertToPointerRoot, CurrentTime);
 				}
 
@@ -4675,7 +4691,7 @@ void DisplayServerX11::process_events() {
 				// Set focus when menu window is re-used.
 				// RevertToPointerRoot is used to make sure we don't lose all focus in case
 				// a subwindow and its parent are both destroyed.
-				if ((xwa.map_state == IsViewable) && !wd.no_focus && !wd.is_popup) {
+				if ((xwa.map_state == IsViewable) && !wd.no_focus && !wd.is_popup && _window_focus_check()) {
 					XSetInputFocus(x11_display, wd.x11_window, RevertToPointerRoot, CurrentTime);
 				}
 

platform/linuxbsd/x11/display_server_x11.h

@@ -354,6 +354,7 @@ class DisplayServerX11 : public DisplayServer {
 	Context context = CONTEXT_ENGINE;
 
 	WindowID _get_focused_window_or_popup() const;
+	bool _window_focus_check();
 
 	void _send_window_event(const WindowData &wd, WindowEvent p_event);
 	static void _dispatch_input_events(const Ref<InputEvent> &p_event);