Fix GTK widgets not appearing inside child frames

* src/xfns.c (x_set_parent_frame): Disable GTK's own frame
synchronization in child frames.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/xfns.c b/src/xfns.c
index c71f2b025f4..cf5823c645b 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -919,6 +919,9 @@ static void
 x_set_parent_frame (struct frame *f, Lisp_Object new_value, Lisp_Object old_value)
 {
   struct frame *p = NULL;
+#ifdef HAVE_GTK3
+  GdkWindow *window;
+#endif
 
   if (!NILP (new_value)
       && (!FRAMEP (new_value)
@@ -942,6 +945,14 @@ x_set_parent_frame (struct frame *f, Lisp_Object new_value, Lisp_Object old_valu
           (GTK_CONTAINER (FRAME_GTK_OUTER_WIDGET (f)),
            p ? GTK_RESIZE_IMMEDIATE : GTK_RESIZE_QUEUE);
 #endif
+
+#ifdef HAVE_GTK3
+      if (p)
+        {
+          window = gtk_widget_get_window (FRAME_GTK_OUTER_WIDGET (f));
+          gdk_x11_window_set_frame_sync_enabled (window, false);
+        }
+#endif
       unblock_input ();
 
       fset_parent_frame (f, new_value);