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Date: Fri, 3 Jul 2015 20:12:13 +0200
Message-ID: <CAHYJk3T_a=TAjVr6e79x8bOh6u+vWO9aDXS=fNNHbm7XejLP_A@mail.gmail.com>
Subject: Re: Undo is also confused with narrow-to-region
From: Mikael Magnusson <mikachu@gmail.com>
To: Oliver Kiddle <okiddle@yahoo.co.uk>
Cc: Zsh workers <zsh-workers@zsh.org>
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On Fri, Jul 3, 2015 at 5:26 PM, Oliver Kiddle <okiddle@yahoo.co.uk> wrote:
> Within narrow-to-region, undo will put back the full BUFFER that is then
> duplicated from PREDISPLAY/POSTDISPLAY. After narrow-to-region, the
> opposite problem occurs with the part that was not part of the BUFFER
> being lost.
>
> This isn't that easy to solve. recursive-edit could save and restore the
> undo structures but for some uses of recursive-edit, such as that shown
> for it in the manual, that might not be the right thing anyway.

Would it be possible to implement some kind of 'zle push-undo-stack'
and 'zle pop-undo-stack'? If you push it you would get a whole new
instance of undo, and popping it then throws all those entries away
again. I can't really think of an instance outside recursive-edit
where it would be useful, though.

-- 
Mikael Magnusson