[gtk+] mir: release surface before rendering parent

[William Hua <williamhua src gnome org>]

commit 0a64a4f3c0bb3af4920f0dbcf48345a3ae7fb866
Author: William Hua <william attente ca>
Date:   Wed Feb 4 10:32:29 2015 +0100

    mir: release surface before rendering parent
    
    We should remove the mir and cairo surface before rendering the
    transient_for, which will regenerate the cairo surface anyways.
    Otherwise, we end up releasing both, when we only really want to get rid
    of the mir surface.

 gdk/mir/gdkmirwindowimpl.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/gdk/mir/gdkmirwindowimpl.c b/gdk/mir/gdkmirwindowimpl.c
index 80b6e56..1d56048 100644
--- a/gdk/mir/gdkmirwindowimpl.c
+++ b/gdk/mir/gdkmirwindowimpl.c
@@ -919,13 +919,12 @@ gdk_mir_window_impl_set_transient_for (GdkWindow *window,
       window->x = impl->transient_x;
       window->y = impl->transient_y;
 
+      /* Remove surface if we had made one before this was set */
+      ensure_no_surface (window);
+
       /* Redraw onto parent */
       redraw_transient (window);
     }
-
-  /* Remove surface if we had made one before this was set */
-  if (should_render_in_parent (window))
-    ensure_no_surface (window);
 }
 
 /* TODO: Remove once we have proper transient window support. */