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bug#23871: 25.1.50; Undo unexpectedly leads to blank buffer


From: Markus Triska
Subject: bug#23871: 25.1.50; Undo unexpectedly leads to blank buffer
Date: Sun, 03 Jul 2016 20:05:31 +0200
User-agent: Emacs/24.4

phillip.lord@russet.org.uk (Phillip Lord) writes:

> I've tried to reproduce #23871, but unfortunately, swiprolog crashes as
> shown below.
>
> The packaged version of swiprolog on my machine is 6.6.4, rather than >
> 7.2. I'm not keen on trying to update to 7.2. Is there a reproduction
> that will work on 6.6.4?

I am trying to find a case that works without invoking Prolog at
all. However, this will definitely take me a while because ediprolog is
also involved and the buffer switching etc. that ediprolog does behind
the scenes may in fact also contribute to the regression with undo.

If you send me your SSH public key, I will create an account for you on
a machine where you can reproduce this issue (with emacs -nw).

Also for you Eli of course!

All the best,
Markus





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