[gnome-control-center] Do not allow adding the same layout twice

[Sergey V. Udaltsov <svu src gnome org>]

commit 6d018d3295b09c05322a62f56d9ce8caca673fcd
Author: Sergey V. Udaltsov <svu gnome org>
Date:   Sat Feb 26 01:59:18 2011 +0000

    Do not allow adding the same layout twice
    
    Just disable the "add" button when already chosen layout is selected
    https://bugzilla.gnome.org/show_bug.cgi?id=642907

 panels/region/gnome-region-panel-xkbltadd.c |   24 +++++++++++++++++++++++-
 1 files changed, 23 insertions(+), 1 deletions(-)
---
diff --git a/panels/region/gnome-region-panel-xkbltadd.c b/panels/region/gnome-region-panel-xkbltadd.c
index ffbaf3a..be12ca7 100644
--- a/panels/region/gnome-region-panel-xkbltadd.c
+++ b/panels/region/gnome-region-panel-xkbltadd.c
@@ -65,6 +65,26 @@ xkb_preview_destroy_callback (GtkWidget * widget)
 	preview_dialog = NULL;
 }
 
+static gboolean
+xkb_layout_chooser_selection_dupe (GtkBuilder * chooser_dialog)
+{
+	gchar *selected_id =
+	    (gchar *) xkb_layout_chooser_get_selected_id (chooser_dialog);
+	gchar **layouts_list, **pl;
+	gboolean rv = FALSE;
+	if (selected_id == NULL)
+		return rv;
+	layouts_list = pl = xkb_layouts_get_selected_list ();
+	while (pl && *pl) {
+		if (!g_ascii_strcasecmp (*pl++, selected_id)) {
+			rv = TRUE;
+			break;
+		}
+	}
+	g_strfreev (layouts_list);
+	return rv;
+}
+
 static void
 xkb_layout_chooser_response (GtkDialog * dialog,
 			     gint response, GtkBuilder * chooser_dialog)
@@ -280,7 +300,9 @@ xkb_layout_chooser_selection_changed (GtkTreeSelection * selection,
 	GtkWidget *add_button = CWID ("btnOk");
 	GtkWidget *preview_button = CWID ("btnPreview");
 	gboolean anything_selected = g_list_length (selected_layouts) == 1;
-	gtk_widget_set_sensitive (add_button, anything_selected);
+	gboolean dupe = xkb_layout_chooser_selection_dupe (chooser_dialog);
+
+	gtk_widget_set_sensitive (add_button, anything_selected && !dupe);
 	gtk_widget_set_sensitive (preview_button, anything_selected);
 }