[gtk+/wip/mir-gdkgl] mir: don't send buffers when using gl_painting on show also

[Marco Trevisan <marcotrevi src gnome org>]

commit 6f74d6cf7381eddb0e3ddcbbb967e80a0e90a29a
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Wed Nov 19 15:07:03 2014 +0100

    mir: don't send buffers when using gl_painting on show also

 gdk/mir/gdkmirwindowimpl.c |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)
---
diff --git a/gdk/mir/gdkmirwindowimpl.c b/gdk/mir/gdkmirwindowimpl.c
index 24e4c06..6956502 100644
--- a/gdk/mir/gdkmirwindowimpl.c
+++ b/gdk/mir/gdkmirwindowimpl.c
@@ -428,10 +428,13 @@ gdk_mir_window_impl_show (GdkWindow *window,
   /* Make sure there's a surface to see */
   ensure_surface (window);
 
-  /* Make sure something is rendered and then show first frame */
-  s = gdk_mir_window_impl_ref_cairo_surface (window);
-  send_buffer (window);
-  cairo_surface_destroy (s);
+  if (!window->gl_paint_context)
+  {
+    /* Make sure something is rendered and then show first frame */
+    s = gdk_mir_window_impl_ref_cairo_surface (window);
+    send_buffer (window);
+    cairo_surface_destroy (s);
+  }
 }
 
 static void