Icon image on gimp menu

Whats this?

I wrote patch codes for gimp and gtk+ to append filter thumbnail on gimp menu.

Change feature of Gtk+ itemfactory to specify pixmap data.
When plug-in install, pixmap (icon) data are transfered to gimp core on wire mechanism.
Install data of pixmap are cached to ~/gimp/pluginrc file; list data is constructed from line number and XPM format lines.
Contain thumbnail data of plug-in sample image.

NOTICE: I found other person wrote GtkIconItemFactory widget, so I want to replace part of my gtk+ patch to this.