Re: A new(?) warning of erase-buffer, which was not seen before.

["Lennart Borgman (gmail)" <lennart.borgman@gmail.com>]

Stefan Monnier wrote:
>>>>> I've been working on some patches to comint to do this, by selectively
>>>>> disabling undo at various points, but it's not entirely straight-forward
>>>>> because you then have to fix up the undo list to account for the
>>>>> unrecorded buffer changes.
>>>> FWIW, erc.el does this kind of selective undo.
>>> How does it deal with changing buffer locations?
> 
>> Nicely.
> 
>>> My attempted solution was to scan through buffer-undo-list, updating
>>> those position, every time I inserted some "hidden from undo" text.
>>> [This isn't typically a performance problem because _usually_
>>> buffer-undo-list is nil when process output is occuring.]
> 
>> That's exactly what ERC does.  See erc-update-undo-list.
> 
> I.e. we should probably add a "insert-without-undo" function which does
> just that.

Yes, please. And also an delete-without-undo.