Currently, if one needs to know the value of a style property for a widget class for which one does not have an instance (imagine you need to paint something in a canvas in the same colors used for even and odd rows in a tree view, for example)

Aparently, apps that do this (firefox and openoffice, e.g., according to mclasen on irc) create a widget and query its style properties.

Here comes a patch that adds:

void gtk_style_get_property (GtkStyle    *style,
                             GType        widget_type,
                             const gchar *property_name,
                             GValue      *value);
void gtk_style_get_valist   (GtkStyle    *style,
                             GType        widget_type,
                             const gchar *first_property_name,
                             va_list      var_args);
void gtk_style_get          (GtkStyle    *style,
                             GType        widget_type,
                             const gchar *first_property_name,
                             ...) G_GNUC_NULL_TERMINATED;