bug#22295: viper-mode undo bug introduced between Nov 10 and Nov 14

[Eli Zaretskii]

> Cc: phillip.lord@russet.org.uk, 22295@debbugs.gnu.org
> From: Michael Kifer <kifer@cs.stonybrook.edu>
> Date: Mon, 16 May 2016 13:14:05 -0400
> 
> >  Another alternative is to make viper use the default Emacs undo, and
> > then ask you and other users of viper to tell where the results don't
> > match your expectations.  It could well be that starting with a clean
> > slate will get us to the goal faster and with less complex code.
> 
> This would be a non-starter and would cause a mass migration to vim. The undo 
> would also then be
> implementation dependent. If, say, "delete 2 words" is implemented 
> differently from how it is now then it would
> be undone via a different sequence of commands. 

Then I guess the current trial-and-error method will have to be the
way.  Too bad, I have hard time believing we will be ready with a
complete solution in time for Emacs 25.1, which is what I hoped.

Thanks.