Re: can undo unamalgamation be turned off reliably and completely?

[Samuel Wales <samologist@gmail.com>]

um, i meant if non-nil.

On 12/1/20, Samuel Wales <samologist@gmail.com> wrote:
> (setq undo-auto-current-boundary-timer t) does not work in my emacs 25
> to turn off amalgamating.
>
> however, i /might/ have thought of a solution.  called-interactively-p
> does not work reliably with defadvice, but this-command-keys might be
> a substitute.  then maybe i can advise all amalgamating commands, and
> if nil, do undo-boundary.  untested.
>
> and then when emacs 26 rolls around, i will try using (setq
> amalgamating-undo-limit 1).  which i presume will work.  thank you for
> all of your comments and, if any of you implemented turning off
> amalgamation, for doing that too.
>
>
> On 11/30/20, Michael Heerdegen <michael_heerdegen@web.de> wrote:
>> Stefan Monnier <monnier@iro.umontreal.ca> writes:
>>
>>> > If you set this variable to, say, t, that should turn off this
>>> > feature.
>>> > Should exist in 25.  May be named "undo-auto--current-boundary-timer"
>>> > there.
>>>
>>> No, this part of undo was all hard coded in C in Emacs-25.
>>
>> I see the timer variable being introduced in Lisp with this commit:
>>
>> | 44dfa86b7d382b84564d68472da1448d08f48129
>> | Author:     Phillip Lord <phillip.lord@newcastle.ac.uk>
>> | AuthorDate: Thu Aug 6 21:33:58 2015 +0100
>> | Commit:     Phillip Lord <phillip.lord@russet.org.uk>
>> | CommitDate: Thu Nov 12 21:06:05 2015 +0000
>> |
>> | Parent:     0aec2aaccd * lisp/emacs-lisp/package.el: Simplify
>> describe-package-1
>> | Contained:  emacs-25 emacs-26 master
>> | Follows:    emacs-24.5-rc3-fixed (5481)
>> | Precedes:   emacs-25.0.90 (1955)
>> |
>> | The heuristic that Emacs uses to add an `undo-boundary' has been
>> | reworked, as it interacts poorly with functions on `post-command-hook'
>> | or `after-change-functions'.
>>
>> Am I interpreting the "Contained" and "Precedes" fields wrong?
>>
>>> It got rewritten in Elisp for Emacs-26, which indeed makes it possible
>>> to
>>> change it much more easily.
>>
>> How would you deactivate it in versions not yet having the rewrite?
>>
>>
>> Thanks,
>>
>> Michael.
>>
>>
>>
>
>
> --
> The Kafka Pandemic
>
> Please learn what misopathy is.
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>


-- 
The Kafka Pandemic

Please learn what misopathy is.
https://thekafkapandemic.blogspot.com/2013/10/why-some-diseases-are-wronged.html