[libdazzle] css: tweak css provider fallback paths

[Christian Hergert <chergert src gnome org>]

commit c4bda4688daf1cf2140e5978e14f1228e5e77349
Author: Christian Hergert <chergert redhat com>
Date:   Mon Jun 5 02:27:55 2017 -0700

    css: tweak css provider fallback paths
    
    First try theme+variant, then theme, then shared.css

 src/theming/dzl-css-provider.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/src/theming/dzl-css-provider.c b/src/theming/dzl-css-provider.c
index bc89c4b..d0b73cc 100644
--- a/src/theming/dzl-css-provider.c
+++ b/src/theming/dzl-css-provider.c
@@ -83,14 +83,23 @@ dzl_css_provider_update (DzlCssProvider *self)
                     NULL);
     }
 
+  /* First check with full path to theme+variant */
   resource_path = g_strdup_printf ("%s/%s%s.css",
                                    self->base_path,
                                    theme_name, prefer_dark_theme ? "-dark" : "");
 
   if (!g_resources_get_info (resource_path, G_RESOURCE_LOOKUP_FLAGS_NONE, &len, &flags, NULL))
     {
+      /* Now try without the theme variant */
       g_free (resource_path);
-      resource_path = g_strdup_printf ("%s/shared.css", self->base_path);
+      resource_path = g_strdup_printf ("%s/%s.css", self->base_path, theme_name);
+
+      /* Now fallback to shared styling */
+      if (!g_resources_get_info (resource_path, G_RESOURCE_LOOKUP_FLAGS_NONE, &len, &flags, NULL))
+        {
+          g_free (resource_path);
+          resource_path = g_strdup_printf ("%s/shared.css", self->base_path);
+        }
     }
 
   /* Nothing to load */