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

[Andreas Röhler]

On 23.03.2016 18:55, Eli Zaretskii wrote:
> > Cc: address@hidden
> > From: Andreas Röhler <address@hidden>
> > Date: Wed, 23 Mar 2016 18:24:38 +0100
> >
> > > Isn't prog-widen the solution to those issues?
> > Hi Eli,
> >
> > doku of prog-widen says
> >
> > "This variable enables the major mode of the
> > main language to use the indentation engine of the sub-mode"
> >
> > This also doesn't sound right.
> Please read the description in the ELisp manual instead.

So let's read this (prog-widen):

"    ... to remove any restrictions
     imposed by the mode’s indentation engine and restore the
     restrictions recorded in ‘prog-indentation-context’.  This prevents
     the indentation engine of a sub-mode from inadvertently operating
     on text outside of the chunk it was supposed to indent, and
     preserves the restriction imposed by the superior mode.  When no
     superior mode is in effect, this function just calls ‘widen’.
"

Don't see in which way this should be better. It lays the burden of 
dealing with the mode in place into prog-mode. IMO wrong place, wrong 
direction.

Expect prog-mode do deliver very basic things common to all programming 
modes. Not dealing with and fixing special needs there.

Modes must meet the specific languages. Prog-mode must not be specific 
and not provide tools for storing things like indentation-context. Let 
the modes indent, fontify and jump around like they want - not thwarting 
their settings seems all needed here.