bug#31027: 27.0.50; xref, tags-location-ring equivalent

[Juri Linkov]

>>> Whether next-error-function is going to be local or not, is subject to
>>> discussion, see https://debbugs.gnu.org/cgi/bugreport.cgi?bug=20489 and
>>> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=30674.
>>
>> I have a wish to close these overgrown bugreports and redesign this feature
>> from scratch ;)
>
> The newer one is not so overgrown yet. I do wish we revert the part where
> next-error-function is buffer local, though, and then you could design this
> possibility as a user option. We discussed the approaches, but it comes out
> pretty complex no matter the way you look at it.

I'll post a request for comments to emacs-devel shortly.