Comment 2 for bug 365923

Attached is a rough implementation of that cell renderer. It's based on GtkCellRendererToggle, except that it renders the cell using a GtkCellRendererPixbuf, merely transferring function calls, and setting the star icon as appropriate. Two star icons are taken from Firefox (what license exactly?).

Untested, but simple enough to be fixed in situation. I guess it should be integrated into the rest of the project to check that it works, else testing would be a useless pain.