bug#15841: Display bugs with cache-long-lines non-nil

[Eli Zaretskii]

Redirecting to a new bug report.

> From: Nathan Trapuzzano <nbtrap@nbtrap.com>
> Date: Fri, 08 Nov 2013 18:11:44 -0500
> Cc: Michael Heerdegen <michael_heerdegen@web.de>, 15797@debbugs.gnu.org,
>       kjambunathan@gmail.com
> 
> Nathan Trapuzzano <nbtrap@nbtrap.com> writes:
> 
> > I haven't figured out a consistent way to screw up the motion commands
> > yet.
> 
> Here we go.  Visit the same file and do:
> 
> M-x linum-mode
> C-o
> C-n
> C-e
> 
> Cursor moves almost to end of entire file.

Should be fixed in trunk revision 115050.

However, there are still problems which can be seen with this recipe:

 emacs -Q --eval "(setq-default cache-long-scans nil)"
 C-x C-f src/xdisp.c
 M-: (setq cache-long-scans t) RET
 M-x linum-mode RET
 M->

Many line numbers near the end of the buffer are not shown in the
margin.