css: No longer expose internal properties

... in gtk_style_properties_lookup_property(). Those properties will
soon stop having pspecs or even being gettable and settable, so better
not tell anyone about it.

diff --git a/gtk/gtkcsscustomproperty.c b/gtk/gtkcsscustomproperty.c
index 1d49492429cfec6f605cac92bb9ece815d0222e4..ab0ec9eb96150d8afcf79a769698fc85bb1c26c0 100644 (file)
--- a/gtk/gtkcsscustomproperty.c
+++ b/gtk/gtkcsscustomproperty.c
@@ -193,7 +193,7 @@ gtk_style_properties_lookup_property (const gchar             *property_name,
 
   node = _gtk_style_property_lookup (property_name);
 
-  if (node)
+  if (GTK_IS_CSS_CUSTOM_PROPERTY (node))
     {
       if (pspec)
         *pspec = node->pspec;