[gtk+] gdkwindow: Allow native subsurface for all parents

[Matthias Clasen <matthiasc src gnome org>]

commit 36575a44249631ee3785e53d55d1361e0b868a2c
Author: Olivier Fourdan <ofourdan redhat com>
Date:   Tue Nov 15 14:49:03 2016 +0100

    gdkwindow: Allow native subsurface for all parents
    
    Under Wayland, a subsurface can have another surface as parent, but
    gdk would not allow native windows if the parent is not the root window.
    
    Allow native subsurface for all parent under Wayland, not just for the
    root window.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=774475

 gdk/gdkwindow.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index 3c3b0a0..0fd2023 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -1220,6 +1220,11 @@ gdk_window_new (GdkWindow     *parent,
   if (window->parent->window_type == GDK_WINDOW_ROOT)
     native = TRUE; /* Always use native windows for toplevels */
 
+#ifdef GDK_WINDOWING_WAYLAND
+  if (window->window_type == GDK_WINDOW_SUBSURFACE)
+    native = TRUE; /* Always use native windows for subsurfaces as well */
+#endif
+
   if (native)
     {
       event_mask = get_native_event_mask (window);