Any Pythonic GTK Undo library?

[Tony Nelson]

I'm looking for a "pythonic" GTK Undo library/class.  It would have a 
framework for Undo/Redo, and would provide Undo/Redo for TextView, 
Entry, and containers and other classes.  In a "batteries included" 
fashion, just instantiating a "UndoableTextView" or "UndoableEntry" or 
"UndoableContainer" would provide Undo and Redo in the right-click menu; 
simply connecting such an object to an "UndoableUIManager" would take 
care of the stock items in the menus and toolbar; and there would be a 
simple connection to some sort of "UndoableDocument" interface or mix-in 
for more global sequencing of Undo/Redo.  Does something like this exist 
for Python or GTK?  Googling didn't turn up anything useful.

I'm disappointed that GTK doesn't do this already.  Making my own seems 
doable, but a fair amount of work.  If there isn't some such thing 
already, is there interest in using one that I make?

I know about GUndo, which doesn't implement any actual undo operations; 
the actual operations would need to be coded for TextView and Entry and 
anything else.
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