[gtk+] Properly propagate expand flags

[Matthias Clasen <matthiasc src gnome org>]

commit 0a3fa74a5235dd2e559bbe659e021feaf326f560
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Oct 20 23:51:57 2010 +0200

    Properly propagate expand flags
    
    When showing a widget that already has need_compute_expand set,
    we need to queue the recomputation on the parent.

 gtk/gtkwidget.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 474f55a..49420c9 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -3810,7 +3810,8 @@ gtk_widget_show (GtkWidget *widget)
           widget->priv->computed_hexpand ||
           widget->priv->computed_vexpand)
         {
-          gtk_widget_queue_compute_expand (widget);
+          if (widget->priv->parent != NULL)
+            gtk_widget_queue_compute_expand (widget->priv->parent);
         }
 
       g_signal_emit (widget, widget_signals[SHOW], 0);