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bug#35254: 27.0.50; cc-mode/electric-pair-mode/electric-layout-mode: bad

From: Alan Mackenzie
Subject: bug#35254: 27.0.50; cc-mode/electric-pair-mode/electric-layout-mode: bad trailing whitespace behavior in cc-mode
Date: Sun, 12 May 2019 16:14:41 +0000
User-agent: Mutt/1.10.1 (2018-07-13)

Hello, Basil.

On Sat, May 11, 2019 at 20:34:51 +0100, Basil L. Contovounesios wrote:
> Alan Mackenzie <address@hidden> writes:

> > On Sat, May 11, 2019 at 10:06:42 -0400, Noam Postavsky wrote:
> >> Alan Mackenzie <address@hidden> writes:

> >> Of course c-mode could rebind it in its mode map (I considered making
> >> `electric-newline-and-maybe-indent' consult `electric-indent-functions'
> >> as well but that won't work because that hook is supposed to run after
> >> the character is inserted).

> > I think we've got enough foggy complexity in the area as it is.  I
> > suppose CC Mode could bind <CR> to `newline-and-indent', but there's now
> > no longer a clean function which does what `newline' used to do, to bind
> > onto C-j.

> Sorry if my question is completely naive or irrelevant (I haven't read
> the discussion very carefully), but how does the command
> c-context-line-break, which is described under "Making the <RET> key
> indent the new line" in (info "(ccmode) Getting Started") relate to this
> issue, if at all?

c-context-line-break doesn't really have much to say in the matter.  The
function is mainly about how to indent the _new_ line, and inserting
various continuation markers.

This bug is about trailing space in the _old_ line not getting removed
on typing <CR>, about which c-context-line-break has nothing to say.

> Thanks,

No problem!

> -- 
> Basil

Alan Mackenzie (Nuremberg, Germany).

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