bug#70136: 30.0.50; compilation-mode [was: comint-mode] doesn't call hack-dir-local-variables-non-file-buffer

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: Eli Zaretskii <eliz@gnu.org>,  70136@debbugs.gnu.org,
>   monnier@iro.umontreal.ca
> Date: Tue, 16 Apr 2024 09:33:51 +0300
> 
> > On the other hand, imagine this situation: you're working on a project
> > with very long lines in some files, so you want your grep buffers to
> > look more compact.  Then you type
> >
> >   M-x add-dir-local-variable RET grep-mode RET truncate-lines RET t RET
> >
> > Wouldn't you be very confused that this doesn't work?
> 
> I agree this would be confusing.
> 
> IMHO, the problem is more wide and it's that dir-local variables
> are not supported in non-file buffers by default.  Maybe a new
> option could enable them not only in compilation buffers,
> but in all non-file buffers?  Or such a new option could be
> a list of non-file modes that should support dir-local variables.

I'm okay with such opt-in behavior.  We can later make it the default
if enough people like it and not many complain about it.

Thanks.