[gtk+/resizegrips] Emit notify::resize-grip-visible when needed

[Matthias Clasen <matthiasc src gnome org>]

commit 8022ee3e5913a86de3b6adc0d7e3571cb7d20d16
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Oct 3 02:01:06 2010 -0400

    Emit notify::resize-grip-visible when needed

 gtk/gtkwindow.c |   22 +++++++++++++++-------
 1 files changed, 15 insertions(+), 7 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index f4d807a..99e0342 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -1204,6 +1204,7 @@ gtk_window_set_property (GObject      *object,
       break;
     case PROP_HAS_RESIZE_GRIP:
       gtk_window_set_has_resize_grip (window, g_value_get_boolean (value));
+      break;
     case PROP_MNEMONICS_VISIBLE:
       gtk_window_set_mnemonics_visible (window, g_value_get_boolean (value));
       break;
@@ -5279,6 +5280,7 @@ resize_grip_destroy_window (GtkWindow *window)
   gdk_window_set_user_data (priv->grip_window, NULL);
   gdk_window_destroy (priv->grip_window);
   priv->grip_window = NULL;
+  update_grip_visibility (window);
 }
 
 void
@@ -5310,16 +5312,22 @@ gtk_window_set_has_resize_grip (GtkWindow *window,
 static void
 update_grip_visibility (GtkWindow *window)
 {
-  gboolean val = gtk_window_resize_grip_is_visible (window);
+  GtkWindowPrivate *priv = window->priv;
+  gboolean val;
 
-  if (val)
-    gdk_window_show (window->priv->grip_window);
-  else
-    gdk_window_hide (window->priv->grip_window);
+  val = gtk_window_resize_grip_is_visible (window);
+
+  if (priv->grip_window != NULL)
+    {
+      if (val)
+        gdk_window_show (priv->grip_window);
+      else
+        gdk_window_hide (priv->grip_window);
+    }
 
-  if (window->priv->resize_grip_visible != val)
+  if (priv->resize_grip_visible != val)
     {
-      window->priv->resize_grip_visible = val;
+      priv->resize_grip_visible = val;
 
       g_object_notify (G_OBJECT (window), "resize-grip-visible");
     }