[gtk+] customproperty: Ensure style properties are registered

[Benjamin Otte <otte src gnome org>]

commit fde43d01e524c90eeef1d611a6174b86226b7bd4
Author: Benjamin Otte <otte redhat com>
Date:   Sat Apr 7 17:24:50 2012 +0200

    customproperty: Ensure style properties are registered
    
    ... before reigstering our own. Also, use that capability to emit a
    warning.

 gtk/gtkcsscustomproperty.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkcsscustomproperty.c b/gtk/gtkcsscustomproperty.c
index bce695d..6504826 100644
--- a/gtk/gtkcsscustomproperty.c
+++ b/gtk/gtkcsscustomproperty.c
@@ -170,6 +170,15 @@ gtk_theming_engine_register_property (const gchar            *name_space,
   g_return_if_fail (G_IS_PARAM_SPEC (pspec));
 
   name = g_strdup_printf ("-%s-%s", name_space, pspec->name);
+
+  /* This also initializes the default properties */
+  if (_gtk_style_property_lookup (pspec->name))
+    {
+      g_warning ("a property with name '%s' already exists", name);
+      g_free (name);
+      return;
+    }
+  
   initial = gtk_css_custom_property_create_initial_value (pspec);
 
   node = g_object_new (GTK_TYPE_CSS_CUSTOM_PROPERTY,
@@ -206,6 +215,13 @@ gtk_style_properties_register_property (GtkStylePropertyParser  parse_func,
 
   g_return_if_fail (G_IS_PARAM_SPEC (pspec));
 
+  /* This also initializes the default properties */
+  if (_gtk_style_property_lookup (pspec->name))
+    {
+      g_warning ("a property with name '%s' already exists", pspec->name);
+      return;
+    }
+  
   initial = gtk_css_custom_property_create_initial_value (pspec);
 
   node = g_object_new (GTK_TYPE_CSS_CUSTOM_PROPERTY,