GNU bug report logs - #22295
viper-mode undo bug introduced between Nov 10 and Nov 14

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Message #132 received at 22295 <at> debbugs.gnu.org (full text, mbox):

From: phillip.lord <at> russet.org.uk (Phillip Lord)
To: Michael Kifer <kifer <at> cs.stonybrook.edu>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 22295 <at> debbugs.gnu.org,
 Stefan Monnier <monnier <at> iro.umontreal.ca>, Jim Meyering <jim <at> meyering.net>
Subject: Re: bug#22295: viper-mode undo bug introduced between Nov 10 and Nov
 14
Date: Wed, 01 Jun 2016 23:41:38 +0100

Michael Kifer <kifer <at> cs.stonybrook.edu> writes:

> On 06/01/2016 06:23 PM, Phillip Lord wrote:
>> Viper's solution of introducing a 'viper symbol is a nice one, but has
>> it's problems. If you do, for example
>>
>> i helo C-b k C-/ C-/
>>
>> We get an error from the undo system.
>>
>> primitive-undo: Unrecognized entry in undo list viper
>
> not in  25.0.50
> viper worked fine with this for 20 years and I'd say it is Emacs breakage, not
> Viper's.

Okay, will check on that and see what has changed. I was surprised no
one had complained about it.


>> we should now already have the cons cell that represents the tail of the
>> buffer-undo-list.
>>
>> This is also quite a big change, and I worry about buffer compaction --
>> viper-old-buffer-undo-list would not be open for GC.
>
> Do you know who made the changes to the emacs undo list? Maybe complain to
> him?

Sadly, that would be me. This is the reason I am trying to fix a mode
that I don't use! Although, by the time I have finished this, maybe I
will know the keystrokes well enough that I will switch.

Phil

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