Name: undoview
URL: http://projects.gnome.org/gtksourceview/

This contains GtkUndoView, which is GtkTextView with undo/redo
support. The code to add the support is borrowed from GtkSourceView.
However since SV has a lot of other stuff we don't want, we borrow
only the undo support and add it to GtkTextView to create a
GtkUndoView.