[gtk+] Allow calling gtk_widget_style_attach() only when realized

[Michael Natterer <mitch src gnome org>]

commit 0231cff9889b4ec0adb7dc61cfeb647a11baf236
Author: Michael Natterer <mitch gimp org>
Date:   Thu Feb 11 09:27:05 2010 +0100

    Allow calling gtk_widget_style_attach() only when realized

 gtk/gtkwidget.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 322ef87..a18fc0c 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -6409,6 +6409,7 @@ void
 gtk_widget_style_attach (GtkWidget *widget)
 {
   g_return_if_fail (GTK_IS_WIDGET (widget));
+  g_return_if_fail (GTK_WIDGET_REALIZED (widget));
 
   widget->style = gtk_style_attach (widget->style, widget->window);
 }