[gnome-software] shell: Use GQueue for the back entry

[Kalev Lember <klember src gnome org>]

commit a24d32ba233244198634261f067f74bbd5149835
Author: Kalev Lember <kalevlember gmail com>
Date:   Thu Jul 31 16:48:17 2014 +0200

    shell: Use GQueue for the back entry
    
    This makes the back button handling similar to what's done in
    GsUpdateDialog.

 src/gs-shell.c |   11 +++++------
 1 files changed, 5 insertions(+), 6 deletions(-)
---
diff --git a/src/gs-shell.c b/src/gs-shell.c
index 47e7198..9d72bff 100644
--- a/src/gs-shell.c
+++ b/src/gs-shell.c
@@ -68,7 +68,7 @@ struct GsShellPrivate
        GsShellCategory         *shell_category;
        GtkBuilder              *builder;
        GtkWindow               *main_window;
-       GSList                  *back_entry_stack;
+       GQueue                  *back_entry_stack;
 };
 
 G_DEFINE_TYPE_WITH_PRIVATE (GsShell, gs_shell, G_TYPE_OBJECT)
@@ -248,7 +248,7 @@ save_back_entry (GsShell *shell)
                g_object_ref (entry->app);
        }
 
-       priv->back_entry_stack = g_slist_prepend (priv->back_entry_stack, entry);
+       g_queue_push_head (priv->back_entry_stack, entry);
 }
 
 static void
@@ -268,9 +268,7 @@ gs_shell_back_button_cb (GtkWidget *widget, GsShell *shell)
        GsShellPrivate *priv = shell->priv;
        BackEntry *entry;
 
-       g_assert (priv->back_entry_stack);
-       entry = priv->back_entry_stack->data;
-       priv->back_entry_stack = g_slist_remove (priv->back_entry_stack, entry);
+       entry = g_queue_pop_head (priv->back_entry_stack);
 
        gs_shell_change_mode (shell, entry->mode, entry->app, entry->category, FALSE);
 
@@ -777,6 +775,7 @@ static void
 gs_shell_init (GsShell *shell)
 {
        shell->priv = gs_shell_get_instance_private (shell);
+       shell->priv->back_entry_stack = g_queue_new ();
        shell->priv->ignore_primary_buttons = FALSE;
 }
 
@@ -789,7 +788,7 @@ gs_shell_finalize (GObject *object)
        GsShell *shell = GS_SHELL (object);
        GsShellPrivate *priv = shell->priv;
 
-       g_slist_free_full (priv->back_entry_stack, (GDestroyNotify) free_back_entry);
+       g_queue_free_full (priv->back_entry_stack, (GDestroyNotify) free_back_entry);
        g_object_unref (priv->builder);
        g_object_unref (priv->cancellable);
        g_object_unref (priv->plugin_loader);