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bug#5570: Emacs C++ mode "ESC C-q" and TAB indenting issue.

From: Alan Mackenzie
Subject: bug#5570: Emacs C++ mode "ESC C-q" and TAB indenting issue.
Date: Sun, 14 Feb 2010 20:10:06 +0000
User-agent: Mutt/1.5.9i

Hi, Bob and Yidong,

On Sun, Feb 14, 2010 at 12:09:39AM -0500, Chong Yidong wrote:
> Forwarding an email with pertinent info to the bug tracker, and to Alan
> the CC-mode maintainer:

> "Bob" <address@hidden> writes:

> > Yes, it does look related to 5490. I can respond to:

I have the horrible suspicion that this is different from 5490.  :-(

> >> (i) Have you ever noticed this bug happening on earlier Emacsen, in
> >> particular Emacs 23.1?

> > Yes, it happened in 23.1 also.

> >> (ii) Does this bug happen every time you use Emacs this long, or
> >> only sometimes?

> > For me it happens within minutes of use. My C++ files are HEAVILY
> > templated and the issue appears to be related to '<' and '>' of
> > template args, e.g.

> > typedef IF<
> >  MemberOf<a,b>::value,
> >  IF<
> >    Length<c,d>::value,
> >    true,
> >     false
> >  >::Result,
> >  false
> >   >::Result  Result;

OK, template brackets are difficult, because they're so difficult to
distinguish from less/greater than.

Bob, seeing as how the bug hits you "withing minutes", is there any
chance you could try and get it reproducible?  Using a dribble file might
be useful (see the page "Checklist" in the Emacs manual; you'd use this
with something like '(open-dribble-file "~/dribble")' at the beginning of
your Emacs session).

If you manage to get it reproducible, could you send me the C++ file
(which I will regard as confidential if needed) together with the
sequence of commands (e.g. the dribble file) which triggers the bug.
Also appreciated would be a dump of your CC Mode configuration, generated
by C-c C-b.

> > I will have several of these, one after the other, and be editing
> > them. By accident I'll leave out a ',' or a '>' or kill & yank lines
> > with similar error. After minutes of such editing, the indentation
> > gets wacked. Sometimes by TAB indentation on a prior line the problem
> > corrects. Sometimes I have to write the buffer and re-visit it.

One other thing.  Would you please try M-: (c-state-cache-init) when in
this state, and tell me if it resolves the badness.  Thanks!

> >>(iv) Are all C(++) buffers in this state, or only some?  Any correlation
> >>  with how many edits have been done on a buffer, or how long it's been
> >>  loaded?

> > Just the buffer with the '<' and '>' in it.

Alan Mackenzie (Nuremberg, Germany).

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