[gnome-software/gnome-3-20] Make app name sorting case insensitive

[Robert Ancell <rancell src gnome org>]

commit 9f01817824c5604f60a7d25ea7e87ce033a11dc2
Author: Robert Ancell <robert ancell canonical com>
Date:   Mon Feb 19 10:42:43 2018 +1300

    Make app name sorting case insensitive

 src/gs-plugin-loader.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)
---
diff --git a/src/gs-plugin-loader.c b/src/gs-plugin-loader.c
index f0f4051c..0b94cee4 100644
--- a/src/gs-plugin-loader.c
+++ b/src/gs-plugin-loader.c
@@ -108,8 +108,16 @@ G_DEFINE_QUARK (gs-plugin-loader-error-quark, gs_plugin_loader_error)
 static gint
 gs_plugin_loader_app_sort_cb (gconstpointer a, gconstpointer b)
 {
-       return g_strcmp0 (gs_app_get_name (GS_APP ((gpointer) a)),
-                         gs_app_get_name (GS_APP ((gpointer) b)));
+       GsApp *app1 = GS_APP ((gpointer) a);
+       GsApp *app2 = GS_APP ((gpointer) b);
+       g_autofree gchar *casefolded_name1 = NULL;
+       g_autofree gchar *casefolded_name2 = NULL;
+
+       if (gs_app_get_name (app1) != NULL)
+               casefolded_name1 = g_utf8_casefold (gs_app_get_name (app1), -1);
+       if (gs_app_get_name (app2) != NULL)
+               casefolded_name2 = g_utf8_casefold (gs_app_get_name (app2), -1);
+       return g_strcmp0 (casefolded_name1, casefolded_name2);
 }
 
 static gint