bug#42424: 27.0.90; replace-match: point is NOT left at the end of replacement

[Stefan Monnier]

> This issue happens when modification hooks modify the text before the
> end of replacement text.

Modification hooks which modify the buffer text are just getting what
they deserve.

> But the end of replacement might be changed inside of `replace_range'.
> So the final movement of point may end up to a wrong place.

This is just one of the many problems.

> Other types of modification (insert or delete) do not have this issue.
> `point' is adjusted before running modification hooks.

Yes, occasionally doing bad things won't bite you in the rear.
That doesn't justify doing those things.

If you want to modify the buffer in response to other buffer
modifications, then record this fact in the modification hook and then
act on it later, e.g. in a timer.
Anything else *will* cause problems sooner or later.


        Stefan