[gnome-control-center] wacom: Protect calibrator UI to spawn animations multiple times

[Carlos Garnacho <carlosg src gnome org>]

commit ee2afb9bd4753799a756bc94957a42154533ee84
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri Nov 29 14:30:10 2013 +0100

    wacom: Protect calibrator UI to spawn animations multiple times
    
    The window state may be updated more than once, so only initiate
    the UI and animations when it's first called.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=719698

 panels/wacom/calibrator/calibrator-gui.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/panels/wacom/calibrator/calibrator-gui.c b/panels/wacom/calibrator/calibrator-gui.c
index 4324b07..d64d9f3 100644
--- a/panels/wacom/calibrator/calibrator-gui.c
+++ b/panels/wacom/calibrator/calibrator-gui.c
@@ -479,6 +479,10 @@ on_fullscreen (GtkWindow           *window,
   if ((event->changed_mask & GDK_WINDOW_STATE_FULLSCREEN) == 0)
     return;
 
+  /* Protect against window state multiple changes*/
+  if (CLUTTER_ACTOR_IS_VISIBLE (area->action_layer))
+    return;
+
   clutter_actor_show (area->action_layer);
   clutter_actor_show (area->clock);