[gnome-software] trivial: Add a small optimisation to avoid using PK for per-user plugins

[Richard Hughes <rhughes src gnome org>]

commit 422ba5356fca44a654a8c75fe099dc44da470429
Author: Richard Hughes <richard hughsie com>
Date:   Tue Dec 22 15:21:29 2015 +0000

    trivial: Add a small optimisation to avoid using PK for per-user plugins

 src/plugins/gs-plugin-packagekit-refine.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/plugins/gs-plugin-packagekit-refine.c b/src/plugins/gs-plugin-packagekit-refine.c
index 78f5169..507596b 100644
--- a/src/plugins/gs-plugin-packagekit-refine.c
+++ b/src/plugins/gs-plugin-packagekit-refine.c
@@ -967,6 +967,10 @@ gs_plugin_refine (GsPlugin *plugin,
                tmp = gs_app_get_metadata_item (app, "DataDir::desktop-filename");
                if (tmp == NULL)
                        continue;
+               if (!g_str_has_prefix (tmp, "/usr/share/")) {
+                       g_debug ("ignoring %s due to prefix", tmp);
+                       continue;
+               }
                ret = gs_plugin_packagekit_refine_from_desktop (plugin,
                                                                app,
                                                                tmp,