[gimp/gimp-2-10] app: in gimp_widget_blink_cancel(), avoid redrawing non-blinking widget

[Ell <ell src gnome org>]

commit df475195d441512431d479de8b3256a02c3192c9
Author: Ell <ell_se yahoo com>
Date:   Mon Dec 10 14:14:34 2018 -0500

    app: in gimp_widget_blink_cancel(), avoid redrawing non-blinking widget
    
    Since commit fe139e566293337fa8e7a4ae64e2e00dc6fe3eaa, when
    blinking a widget, we cancel blinking for all its ancestors.  Avoid
    redrawing all the ancestors as a result, unless they're actually
    blinking.  This prevents some noticeable lag when blinking a
    widget.
    
    (cherry picked from commit 5a2dee29d76b3d65d41804875581dee30500f270)

 app/widgets/gimpwidgets-utils.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/app/widgets/gimpwidgets-utils.c b/app/widgets/gimpwidgets-utils.c
index f14f6b1cf5..a460fa938d 100644
--- a/app/widgets/gimpwidgets-utils.c
+++ b/app/widgets/gimpwidgets-utils.c
@@ -1505,9 +1505,12 @@ void gimp_widget_blink_cancel (GtkWidget *widget)
 {
   g_return_if_fail (GTK_IS_WIDGET (widget));
 
-  gimp_highlight_widget (widget, FALSE);
+  if (g_object_get_data (G_OBJECT (widget), "gimp-widget-blink"))
+    {
+      gimp_highlight_widget (widget, FALSE);
 
-  g_object_set_data (G_OBJECT (widget), "gimp-widget-blink", NULL);
+      g_object_set_data (G_OBJECT (widget), "gimp-widget-blink", NULL);
+    }
 }
 
 /**