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


From: Phillip Lord
Subject: bug#23871: 25.1.50; Undo unexpectedly leads to blank buffer
Date: Sun, 03 Jul 2016 21:23:41 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.95 (gnu/linux)

Markus Triska <triska@metalevel.at> writes:

> 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).

This is probably not going to help. I'll probably need to rebuild emacs
on the same machine.

How complex is the interaction with prolog? If it's just calling it
as a repl, then a shell script which dumps the same output should work.

Phil





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