[gtk+/gtk-3-16] widget: Make sure we only run controllers on realized widgets

[Carlos Garnacho <carlosg src gnome org>]

commit c2589026ae146ba862e3e7f4084dd00e9117b924
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Sep 21 15:09:32 2015 +0200

    widget: Make sure we only run controllers on realized widgets
    
    The default event bubbling paths are prone to just running event controllers
    even after the widget was potentially unrealized/destroyed in an event
    handler callback, so bail out early if that's the case.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=755352

 gtk/gtkwidget.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index bb380d9..f3e31e3 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -7425,6 +7425,9 @@ _gtk_widget_run_controllers (GtkWidget           *widget,
     {
       GList *next = l->next;
 
+      if (!WIDGET_REALIZED_FOR_EVENT (widget, event))
+        break;
+
       data = l->data;
 
       if (data->controller == NULL)