widget: Take a ref during ::unrealize emission

In order to prevent invalid memory access/crashes if the widget is
destroyed in a callback of that signal.

https://bugzilla.gnome.org/show_bug.cgi?id=745829

diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 043fac48bf20df0072c181184558138d4c92f6bb..5e0a9cb62a391b3d7706e01a7c07bff4653a45bb 100644 (file)
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -5566,6 +5566,7 @@ gtk_widget_unrealize (GtkWidget *widget)
 {
   g_return_if_fail (GTK_IS_WIDGET (widget));
 
+  g_object_ref (widget);
   gtk_widget_push_verify_invariants (widget);
 
   if (widget->priv->has_shape_mask)
@@ -5592,6 +5593,7 @@ gtk_widget_unrealize (GtkWidget *widget)
     }
 
   gtk_widget_pop_verify_invariants (widget);
+  g_object_unref (widget);
 }
 
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