[gtk+] Fix an oversight in mnemonic handling

[Matthias Clasen <matthiasc src gnome org>]

commit 6382eac6d85409a43b9a3b96cd303338de582f65
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jun 18 22:08:31 2009 -0400

    Fix an oversight in mnemonic handling
    
    In some situations, GtkButton would ignore the use-underline
    property. This was reported in bug 586330.

 gtk/gtkbutton.c |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkbutton.c b/gtk/gtkbutton.c
index d749344..43ec818 100644
--- a/gtk/gtkbutton.c
+++ b/gtk/gtkbutton.c
@@ -997,9 +997,14 @@ gtk_button_construct_child (GtkButton *button)
 
       if (label_text)
 	{
-	  label = gtk_label_new_with_mnemonic (label_text);
-	  gtk_label_set_mnemonic_widget (GTK_LABEL (label), 
-					 GTK_WIDGET (button));
+          if (button->use_underline)
+            {
+	      label = gtk_label_new_with_mnemonic (label_text);
+	      gtk_label_set_mnemonic_widget (GTK_LABEL (label),
+                                             GTK_WIDGET (button));
+            }
+          else
+            label = gtk_label_new (label_text);
 
 	  if (priv->image_position == GTK_POS_RIGHT ||
 	      priv->image_position == GTK_POS_BOTTOM)