Undo system for Gnome applications

[×××××× ××××× <tombackton gmail com>]

Hello,

I noticed each Gnome application (Gedit, Gnote, Planner and many many
more) has its own way to implement undo-redo capabilities. Is there a
reason we don't use a common undo-redo interface? Even if the interface
itself is very simple (and it is), using a common one minimizes code
duplication, saves time and helps programs integrate.

I think having an undo-redo interface in Gtk (or Glib) can be very
useful, what do you think?