[gtk+] styleproperties: Add a warning

[Benjamin Otte <otte src gnome org>]

commit bd8fefb20e42d0ac47f1d561db715e4f1f398e29
Author: Benjamin Otte <otte redhat com>
Date:   Sat Jan 14 17:20:15 2012 +0100

    styleproperties: Add a warning
    
    GtkStyleProperties stores computed values. Make sure it does.

 gtk/gtkstyleproperties.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkstyleproperties.c b/gtk/gtkstyleproperties.c
index a92d722..4643a93 100644
--- a/gtk/gtkstyleproperties.c
+++ b/gtk/gtkstyleproperties.c
@@ -439,6 +439,8 @@ _gtk_style_properties_set_property_by_property (GtkStyleProperties  *props,
   PropertyData *prop;
   GValue *val;
 
+  g_return_if_fail (G_VALUE_TYPE (value) == _gtk_css_style_property_get_computed_type (style_prop));
+
   priv = props->priv;
   prop = g_hash_table_lookup (priv->properties, style_prop);