[gnome-software] Show the highest available distro upgrade

[Kalev Lember <klember src gnome org>]

commit fbe29c69eaf6cb6640cc4c18b99fab4cd0729d02
Author: Kalev Lember <klember redhat com>
Date:   Tue Oct 24 14:37:42 2017 +0200

    Show the highest available distro upgrade
    
    The intent was always to show the highest version (e.g. F27 over F26),
    but the implementation broke when GsAppList switched from list to array,
    reversing the sort order.
    
    This commit switches the UI code over to relying on getting upgrades in
    the ascending sort order from the plugin loader.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1494061

 src/gs-updates-page.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/gs-updates-page.c b/src/gs-updates-page.c
index 71a5e29..2133d63 100644
--- a/src/gs-updates-page.c
+++ b/src/gs-updates-page.c
@@ -1071,7 +1071,8 @@ gs_updates_page_get_upgrades_cb (GObject *source_object,
                gs_updates_page_clear_flag (self, GS_UPDATES_PAGE_FLAG_HAS_UPGRADES);
                gtk_widget_set_visible (self->upgrade_banner, FALSE);
        } else {
-               GsApp *app = gs_app_list_index (list, 0);
+               /* rely on the app list already being sorted */
+               GsApp *app = gs_app_list_index (list, gs_app_list_length (list) - 1);
                g_debug ("got upgrade %s", gs_app_get_id (app));
                gs_upgrade_banner_set_app (GS_UPGRADE_BANNER (self->upgrade_banner), app);
                gs_updates_page_set_flag (self, GS_UPDATES_PAGE_FLAG_HAS_UPGRADES);