xwm: WM_TRANSIENT_FOR should not point to override-redirect window

The override-redirect window will not be assigned a shell_surface
object. If it is used as a parent window, it will cause a crash
when calling the set_parent function.

The EWMH specification does not describe the behavior of an
override-redirect window as a parent window, so we should ignore
this case.

Signed-off-by: Liu, Kai1 <kai1.liu@intel.com>
(cherry picked from commit b468687dd2663240d1613bf4a917f049ef09af46)

xwayland/window-manager.c

@@ -3048,7 +3048,9 @@ xserver_map_shell_surface(struct weston_wm_window *window,
 	} else if (window->override_redirect) {
 		xwayland_interface->set_xwayland(window->shsurf,
 						 window->x, window->y);
-	} else if (window->transient_for && window->transient_for->surface) {
+	} else if (window->transient_for &&
+		   !window->transient_for->override_redirect &&
+		   window->transient_for->surface) {
 		parent = window->transient_for;
 		if (weston_wm_window_type_inactive(window)) {
 			xwayland_interface->set_transient(window->shsurf,