On Fri, 2016-06-10 at 11:35 +0530, Kamalpreet Grewal wrote:

Hi all

Is there some guide/reference available from where I can learn on how to implement undo and redo functions associated to something new feature added?

Excellent question. I don't think so. I wish there were. The best source I know about at the moment is the comment at the top of document-undo.cpp

Tav