[gtk+/composite-templates] Fix mnemonic activation for some printer option widgets

[Juan Pablo Ugarte <jpu src gnome org>]

commit d92a7fca25a7b7a0d3b5b13c8d3bd96abb4e52f6
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Aug 31 22:44:45 2012 -0400

    Fix mnemonic activation for some printer option widgets
    
    The file type radio group has a mnemonic on its label, but
    activating it did not work, since GtkPrinterOptionWidget did
    not know to forward the activation to one of the buttons.

 gtk/gtkprinteroptionwidget.c |   15 ++++++++++-----
 1 files changed, 10 insertions(+), 5 deletions(-)
---
diff --git a/gtk/gtkprinteroptionwidget.c b/gtk/gtkprinteroptionwidget.c
index a62fd0c..44c54ad 100644
--- a/gtk/gtkprinteroptionwidget.c
+++ b/gtk/gtkprinteroptionwidget.c
@@ -826,11 +826,16 @@ construct_widgets (GtkPrinterOptionWidget *widget)
       gtk_widget_show (priv->box);
       gtk_box_pack_start (GTK_BOX (widget), priv->box, TRUE, TRUE, 0);
       for (i = 0; i < source->num_choices; i++)
-	group = alternative_append (priv->box,
-                                    source->choices_display[i],
-                                    source->choices[i],
-                                    widget,
-                                    group);
+        {
+	  group = alternative_append (priv->box,
+                                      source->choices_display[i],
+                                      source->choices[i],
+                                      widget,
+                                      group);
+          /* for mnemonic activation */
+          if (i == 0)
+            priv->button = group->data;
+        }
 
       if (source->display_text)
 	{