bug#34525: replace-regexp missing some matches

[Alan Mackenzie]

Hello, Eli

On Tue, Feb 26, 2019 at 19:20:03 +0200, Eli Zaretskii wrote:
> > Date: Tue, 26 Feb 2019 16:55:05 +0000
> > Cc: daniel.lopez999@gmail.com, monnier@iro.umontreal.ca, 
> > 34525@debbugs.gnu.org
> > From: Alan Mackenzie <acm@muc.de>

> > --- a/src/syntax.c
> > +++ b/src/syntax.c
> > @@ -330,6 +330,10 @@ update_syntax_table (ptrdiff_t charpos, EMACS_INT 
> > count, bool init,
> >    bool invalidate = true;
> >    INTERVAL i;

> > +  /* TEMPORARY STUFF, 2019-02-26 */
> > +  i = interval_of (charpos, object);
> > +  gl_state.backward_i = gl_state.forward_i = i;
> > +  /* END OF TEMPORARY STUFF */
> >    if (init)
> >      {
> >        gl_state.old_prop = Qnil;

> Does that slow down the search in any significant way?

I think it does.  Hitting the space bar between the occurrences of Bitmap
in C-u M-% feels somewhat sluggish.  But I'm also running on an
unoptimised build, which I'm not used to.

> In any case, this could be done only if the buffer has been changed
> since the last time the interval was cached, right?

I just tried that, and the bug symptoms reappeared again.  It appears to
be a bit more subtle than I thought.  But I think that should be doable.

> We could even get fancy and check whether the changes were before or
> after the cached interval.

Indeed.

-- 
Alan Mackenzie (Nuremberg, Germany).