bug#5570: automatic cache validation

[Paul Pogonyshev]

Chong Yidong wrote:
> > >>> Does
> > >>>    M-x (c-state-cache-init)
> > >>> fix it?
> > >
> > >> No, it does not.
> > >
> >
> > I just got the problem again, while editing gtkutil.c in Emacs.  There
> > M-: (c-state-cache-init) did indeed fix the problem.
> >
> > So it sometimes help.  I guess this only adds to the confusion...
> 
> You sent this message on March 22.  That was the date Alan checked this
> into the branch:
> 
>    2010-03-22  Alan Mackenzie  <acm@muc.de>
> 
>       * progmodes/cc-engine.el (c-remove-stale-state-cache):
>       Fix off-by-one error.  Fixes bug #5747.
> 
> The patch was merged to the trunk a couple days later.  I don't know
> whether you were running with it when you made the above observation.
> 
> So, are you still observing the problem after the patch?

Not directed to me, but I can answer as well.

Yes, I see the problem, though I'm not sure if it is "the" problem,
since there might be many similar ones.

* At least in some cases M-x (c-state-cache-init) doesn't help, but
  C-x RET r (buffer reloading) does;

* Occasionally even buffer reloading doesn't help, so I have to kill
  the buffer and open the file again;

* Sometimes I get wrong indentation which miraculously fixes itself
  after I hit TAB next time;

* Sometimes when I type in a C string (like "bla-bla-bla"), first
  character after the opening quote gets eaten because of a Lisp
  error.  Will report as separate bug when it happens if I don't
  forget.

And yes, I double-verified that I do have the fix in the version I'm
running now.

Paul