[gtk+] wayland: Ensure the parent is committed after repositioning subsurfaces

[Carlos Garnacho <carlosg src gnome org>]

commit d34f2526c42b3c1915f01155acf16042dafa4bf3
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Aug 27 12:03:28 2014 +0200

    wayland: Ensure the parent is committed after repositioning subsurfaces
    
    Subsurface position is deemed part of the state of the parent surface, so
    ensure wl_surface_commit() happens on the parent surface if none is
    scheduled, so the repositioning takes place.

 gdk/wayland/gdkwindow-wayland.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/gdk/wayland/gdkwindow-wayland.c b/gdk/wayland/gdkwindow-wayland.c
index 6875099..e8b2ecf 100644
--- a/gdk/wayland/gdkwindow-wayland.c
+++ b/gdk/wayland/gdkwindow-wayland.c
@@ -1265,7 +1265,17 @@ gdk_window_wayland_move_resize (GdkWindow *window,
           window->y = y;
 
           if (impl->subsurface)
-            wl_subsurface_set_position (impl->subsurface, x, y);
+            {
+              GdkWindowImplWayland *parent_impl;
+
+              wl_subsurface_set_position (impl->subsurface, x, y);
+
+              g_assert (impl->transient_for != NULL);
+              parent_impl = GDK_WINDOW_IMPL_WAYLAND (impl->transient_for->impl);
+
+              if (parent_impl->surface && !parent_impl->pending_commit)
+                wl_surface_commit (parent_impl->surface);
+            }
         }
     }