Re: [Emacs-diffs] scratch/widen-less a4ba846: Replace prog-widen with consolidating widen calls

[Dmitry Gutov]

On 11/30/17 3:31 PM, Tom Tromey wrote:
> Yes, IIRC mhtml-mode narrows so that a sub-mode won't try to examine
> parts of the buffer that have a different syntax.  Whether you consider
> this ugly or not is perhaps related to your stance on the whole widening
> issue.  My view, though, is that there is a problem here intrinsic to
> multi-modes: something has to tell the sub-modes about the relevant
> boundaries in some way;

Err, no. Ugly or not is beside the point (I personally prefer this 
approach, please also take a look at the branch referenced in this 
thread subject).

Thing is, if you're using prog-indentation-context as it's now 
implemented, you're "supposed to" indicate the narrowing bounds via 
setting the second element of that list, instead of calling 
narrow-to-region directly. Of course, that also requires support from 
the major modes in question.

> so if the narrowing/widening stuff is changed,
> something new will have to be invented here.

See above. The "something new" has a few rough edges, so this discussion 
is about revisiting those choices.