[gnome-initial-setup] gis-assistant: Hide the back button on the first page

[Jasper St. Pierre <jstpierre src gnome org>]

commit dab107c4e0c97d3e123cd0d278ee593514cead82
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Wed Nov 14 12:32:54 2012 -0500

    gis-assistant: Hide the back button on the first page

 gnome-initial-setup/gis-assistant.c |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)
---
diff --git a/gnome-initial-setup/gis-assistant.c b/gnome-initial-setup/gis-assistant.c
index da95640..858d6c6 100644
--- a/gnome-initial-setup/gis-assistant.c
+++ b/gnome-initial-setup/gis-assistant.c
@@ -127,21 +127,19 @@ update_navigation_buttons (GisAssistant *assistant)
   GisAssistantPrivate *priv = assistant->priv;
   GisPage *page = priv->current_page;
   GisAssistantPagePrivate *page_priv;
-  gboolean can_go_backward, can_go_forward, is_last_page;
+  gboolean can_go_forward, is_first_page, is_last_page;
 
   if (page == NULL)
     return;
 
   page_priv = page->assistant_priv;
 
-  can_go_backward = (page_priv->link->prev != NULL);
-  gtk_widget_set_sensitive (priv->back, can_go_backward);
-
   can_go_forward = gis_page_get_complete (page);
   gtk_widget_set_sensitive (priv->forward, can_go_forward);
 
+  is_first_page = (page_priv->link->prev == NULL);
   is_last_page = (page_priv->link->next == NULL);
-  gtk_widget_set_visible (priv->back, !is_last_page);
+  gtk_widget_set_visible (priv->back, !is_first_page && !is_last_page);
   gtk_widget_set_visible (priv->forward, !is_last_page);
 
   if (gis_page_get_use_arrow_buttons (page))