Re: [Emacs-diffs] widen-limits c331b66: Implement buffer-widen-limits functionality

["Andreas Röhler" <andreas.roehler@online.de>]

On 23.03.2016 12:58, Vitalie Spinu wrote:
>>> On Wed, Mar 23 2016 08:16, Andreas Röhler wrote:
>> preventing unwanted widen instead seems the way to go.
> That's precisely what extra limit do. Prevent unwanted widen. How do you propose
> to implement that?
>
> I see 4 ways to go about it:
>
>    1) Add an extra prog-widen and teach all modes out there to use it in contexts
>       like syntax-parsing, indentation, font-lock and who know what else. A half
>       backed version of this in already part of emacs.
>
>    2) Have low level restrictions directly in `widen` and a macro
>       `with-widen-limit` that multi-modes can use. This is the current patch.
>
>    3) Have two types of narrowing (soft and hard). This is harder to implement
>       but has the benefit that it can be used in non-transient situations like
>       Info mode.
>
>    4) Bring widen to elisp and allow minor modes (and Info mode) advice widen in
>       whatever way they see.
>
> I think (1) is a bad idea. (4) is simplest and very general. (3) might be useful
> but it's hard. (2) is implemented to get rid of (1).
>
> I proposed (4) very early in the thread, but didn't hear much support for
> it. There are only three trivial usages of Fwiden in C code. Bringing `narrow`
> to elisp is equally easy.
>
>    Vitalie

Hi Vitali,

may you point me to spot/bug where widen goes wrong?

Thanks,

Andreas