bug#5998: 23.1.96; Breadcrumbs defeat C-u 1 C-v in Info

[Eli Zaretskii]

> From: Juri Linkov <juri@jurta.org>
> Cc: Stefan Monnier <monnier@IRO.UMontreal.CA>,  5998@debbugs.gnu.org
> Date: Fri, 23 Apr 2010 19:57:31 +0300
> 
> >> Fine by me, it's a good change anyway.  But we should still try and fix
> >> the underlying redisplay bug, of course.
> >
> > For that, I'd request a separate bug report, with a clear recipe to
> > reproduce ``the bug'' and an explanation what behavior was expected.
> 
> I tried to create a clear recipe to reproduce it:
> 
> (progn
>   (goto-char (point-min))
>   (insert "line 0\nline 1\nline 2\nline 3\n")
>   (narrow-to-region (+ 7 (point-min)) (point-max))
>   (let ((ov (make-overlay (point-min) (+ 6 (point-min)))))
>     (overlay-put ov 'invisible t)
>     (overlay-put ov 'after-string "after-string 1")
>     (overlay-put ov 'evaporate t))
>   (goto-char (point-min))
>   (scroll-up 1))
> 
> but it doesn't fail.  Something more from Info mode affects it.

Okay, but why do you think the bug is in redisplay?