Re: emacs-29 b18754bb179: Minor improvements in c-ts-mode and docs

[Dmitry Gutov]

On 16/02/2023 14:03, Eli Zaretskii wrote:
> > Date: Thu, 16 Feb 2023 13:17:41 +0200
> > Cc: emacs-devel@gnu.org
> > From: Dmitry Gutov <dgutov@yandex.ru>
> >
> > On 16/02/2023 09:32, Eli Zaretskii wrote:
> > > I consider it confusing and sub-optimal
> > > to have some C-related feature described in the Emacs user manual that
> > > works only in CC Mode.  We have a couple of other keybindings in
> > > c-ts-mode.el, for the same reasons.
> >
> > I'm not going to chime in about every such keybinding, but this could be
> > our chance to reduce inconsistency between C mode and other language modes.
>
> We could at least discuss that, sure.  Is there a list of
> inconsistencies between those modes available anywhere?

From past discussions and looking at 'C-h m':

- "electric" behaviors: CC Mode's commands vs. electric-indent-mode and 
electric-pair-mode.
- c-subword-mode vs subword-mode
- c-display-defun-name vs which-function-mode
- c-indent-exp vs prog-indent-sexp
- c-indent-defun/c-fill-paragraph vs prog-fill-reindent-defun
- c-indent-line-or-region vs indent-for-tab-command and indent-region.

Curious how c-indent-line-or-region doesn't mind depending on 
transient-mark-mode being on.

> The next question, of course, is how to go about reducing the
> inconsistencies.  What you proposed here is simply drop the
> keybinding,

I also suggested, alternatively, that transient-mark-mode, when turned 
off, creates a global binding for comment-region (also with 'C-c C-c'). 
I'm guessing (almost?) all of the users who turn it off simply started 
with Emacs when that was the default behavior. If they haven't reported 
the lack of this binding in various modes, they aren't going to mind the 
shadowing of it as well.

> but that might not be a good idea for other
> inconsistencies, even if we finally decide that for this one it is
> okay.

The general plan could be:

- Wait for a complaint or a bug report.
- See if there is a generic feature which could be used instead. Or 
whether it could be tweaked.
- Or whether a new feature would benefit most/all programming modes and 
can be added to prog-mode instead, and it's easy enough to do.
- Add stuff to c-ts-mode otherwise.