Re: How can I undo a change from a modification-hook?

["Clément Pit-Claudel" <cpitclaudel@gmail.com>]

On 2017-04-27 08:48, Stefan Monnier wrote:
>> Of course, I could rewrite the queuing logic to be more resilient to this
>> kind of changes.  But the question is about ways to prevent edits, and
>> I think it's more general than this particular example.
>
> Then I woulnd't worry too much about it: the cases where the after-hook
> is called "outside" of the before hook's beg/end are basically bugs and
> IIUC there are no known remaining cases in Emacs-26 (IIRC there are some
> known cases in Emacs-25 where this occurs, mostly in
> insert-file-contents (i.e. revert-buffer)).

Got it, thanks.  I already have specialized code for revert-buffer, so that should be fine.
What happens if a deletion causes an overlay to evaporate? The undo list doesn't record that, does it? Or will the evaporation be delayed until all modification hooks have run?

Clément.