[gtk+/overlay: 19/34] overlay: check that the main widget is an ancestor of relative widget

[Matthias Clasen <matthiasc src gnome org>]

commit 113abf4970d07d70ceef2ad16df6534ff60ffaf4
Author: Ignacio Casal Quinteiro <icq gnome org>
Date:   Fri May 27 00:12:21 2011 +0200

    overlay: check that the main widget is an ancestor of relative widget

 gtk/gtkoverlay.c |   17 +++++++++++++++--
 1 files changed, 15 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkoverlay.c b/gtk/gtkoverlay.c
index bc2bc91..819021e 100644
--- a/gtk/gtkoverlay.c
+++ b/gtk/gtkoverlay.c
@@ -164,8 +164,21 @@ gtk_overlay_set_property (GObject      *object,
   switch (prop_id)
     {
     case PROP_RELATIVE_WIDGET:
-      priv->relative_widget = g_value_get_object (value);
-      gtk_widget_queue_resize_no_redraw (GTK_WIDGET (overlay));
+      {
+        GtkWidget *relative_widget;
+
+        relative_widget = g_value_get_object (value);
+
+        if (priv->main_widget == NULL ||
+            (relative_widget != NULL &&
+             !gtk_widget_is_ancestor (priv->main_widget, relative_widget)))
+          {
+            g_warning ("relative_widget must be a child of the main widget");
+            break;
+          }
+        priv->relative_widget = relative_widget;
+        gtk_widget_queue_resize_no_redraw (GTK_WIDGET (overlay));
+      }
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);