* plugins/gtk+/glade-gtk.c, plugins/gtk+/gtk+.xml.in:
	  - Sync attributes when they are set to be used directly and not by the model (fixes loaded state
	    of explicitly set cell renderer properties).
	  - Fix last patch to reset cellrenderer attributes from a GladeProperty::value-changed signal
	    instead of the property mutator implementation (as the "columns" property is construct-only
	    and the widget is rebuilt - property reference lists are unavailable at ->set_property time).