Merge branch 'for-main' into 'main'

Tweak init requirement for displays

See merge request GNOME/gtk!7879

gdk/gdkdisplaymanager.c

@@ -332,7 +332,8 @@ gdk_display_manager_get_default_display (GdkDisplayManager *manager)
 GdkDisplay *
 gdk_display_get_default (void)
 {
-  gdk_ensure_initialized ();
+  if (!gdk_is_initialized ())
+    return NULL;
 
   return gdk_display_manager_get_default_display (gdk_display_manager_get ());
 }