[metacity] theme-viewer: search themes in system data dirs

[Alberts Muktupāvels <muktupavels src gnome org>]

commit d6861acffeda97ac31815e99a0c5a1f5383b2714
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue Jun 7 13:01:26 2016 +0300

    theme-viewer: search themes in system data dirs

 theme-viewer/theme-viewer-window.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/theme-viewer/theme-viewer-window.c b/theme-viewer/theme-viewer-window.c
index 5d46f29..a0d4a03 100644
--- a/theme-viewer/theme-viewer-window.c
+++ b/theme-viewer/theme-viewer-window.c
@@ -657,6 +657,8 @@ type_combo_box_changed_cb (GtkComboBox       *combo_box,
   MetaThemeType type;
   GSList *themes;
   gchar *themes_dir;
+  const gchar *const *xdg_data_dirs;
+  gint i;
   GSList *theme;
 
   theme_combo_box_text = GTK_COMBO_BOX_TEXT (window->theme_combo_box);
@@ -674,6 +676,14 @@ type_combo_box_changed_cb (GtkComboBox       *combo_box,
   get_valid_themes (window, themes_dir, type, &themes);
   g_free (themes_dir);
 
+  xdg_data_dirs = g_get_system_data_dirs ();
+  for (i = 0; xdg_data_dirs[i] != NULL; i++)
+    {
+      themes_dir = g_build_filename (xdg_data_dirs[i], "themes", NULL);
+      get_valid_themes (window, themes_dir, type, &themes);
+      g_free (themes_dir);
+    }
+
   themes_dir = g_build_filename (g_get_user_data_dir (), "themes", NULL);
   get_valid_themes (window, themes_dir, type, &themes);
   g_free (themes_dir);