[gnome-tweak-tool/gnome-3-26] appearance: Always offer Adwaita and High Contrast GTK+ themes

[Jeremy Bicha <jbicha src gnome org>]

commit 8a6bfd64a6c5c1ee7ef2bb847e9e5d6804662267
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Fri Nov 3 14:42:13 2017 -0400

    appearance: Always offer Adwaita and High Contrast GTK+ themes
    
    since they're built into GTK+ 3

 gtweak/tweaks/tweak_group_appearance.py |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtweak/tweaks/tweak_group_appearance.py b/gtweak/tweaks/tweak_group_appearance.py
index 483d028..84dd120 100644
--- a/gtweak/tweaks/tweak_group_appearance.py
+++ b/gtweak/tweaks/tweak_group_appearance.py
@@ -53,7 +53,8 @@ class GtkThemeSwitcher(GSettingsComboTweak):
         dirs = ( os.path.join(gtweak.DATA_DIR, "themes"),
                  os.path.join(GLib.get_user_data_dir(), "themes"),
                  os.path.join(os.path.expanduser("~"), ".themes"))
-        valid = walk_directories(dirs, lambda d:
+        valid = ['Adwaita', 'HighContrast']
+        valid += walk_directories(dirs, lambda d:
                     os.path.exists(os.path.join(d, "gtk-3.0", "gtk.css")) or \
                          os.path.exists(os.path.join(d, "gtk-3.{}".format(gtk_ver))))
         return set(valid)