[gnome-builder] highlight: add some fallback lookup paths for styles that don't exist

[Christian Hergert <chergert src gnome org>]

commit d7bb6623f2c70ae6d0d7b307491cde49b51cd8a8
Author: Christian Hergert <christian hergert me>
Date:   Thu Mar 26 20:50:47 2015 -0700

    highlight: add some fallback lookup paths for styles that don't exist

 libide/ide-highlight-engine.c |   15 ++++++++++++---
 1 files changed, 12 insertions(+), 3 deletions(-)
---
diff --git a/libide/ide-highlight-engine.c b/libide/ide-highlight-engine.c
index a45a099..441ef22 100644
--- a/libide/ide-highlight-engine.c
+++ b/libide/ide-highlight-engine.c
@@ -63,6 +63,7 @@ sync_tag_style (GtkSourceStyleScheme *style_scheme,
   g_autofree gchar *foreground = NULL;
   g_autofree gchar *background = NULL;
   g_autofree gchar *style_name = NULL;
+  const gchar *colon;
   GtkSourceStyle *style;
   gboolean foreground_set = FALSE;
   gboolean background_set = FALSE;
@@ -83,11 +84,19 @@ sync_tag_style (GtkSourceStyleScheme *style_scheme,
 
   g_object_get (tag, "name", &style_name, NULL);
 
-  if ((style_name == NULL) ||
-      (style_scheme == NULL) ||
-      !(style = gtk_source_style_scheme_get_style (style_scheme, style_name)))
+  if ((style_name == NULL) || (style_scheme == NULL))
     return;
 
+  style = gtk_source_style_scheme_get_style (style_scheme, style_name);
+  if (style == NULL && (colon = strchr (style_name, ':')))
+    {
+      gchar defname[64];
+      g_snprintf (defname, sizeof defname, "def%s", colon);
+      style = gtk_source_style_scheme_get_style (style_scheme, defname);
+      if (style == NULL)
+        return;
+    }
+
   g_object_get (style,
                 "background", &background,
                 "background-set", &background_set,