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

[Stefan Monnier <monnier@iro.umontreal.ca>]

>>>> 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.


        Stefan