bug#12277: 24.1.50; Graphical issues with linum-mode and fringe

[Eli Zaretskii]

> From: Robert Dallas Gray <mail@robertdallasgray.com>
> Date: Mon, 27 Aug 2012 09:37:14 +0100
> 
> Bearing in mind this affects Cocoa Emacs on OS X, in windowed mode:
> 
> cd /Applications/Emacs.app/Contents/MacOS
> ./Emacs -Q
> M-x scroll-bar-mode (to turn scroll bars off)
> (now visit a file with contents large enough to require scrolling)
> C-x 3 (to split the window vertically)
> M-x linum-mode
> 
> Now scroll the right-hand window (using the mouse wheel seems to reproduce 
> the glitch more often). The black vertical bar between the two windows 
> intermittently disappears or becomes 'broken'.

When the vertical line separating the two windows disappears or
becomes broken, does it get corrected if you wait for a while, or does
it stay corrupted forever, until the next scroll?

FWIW, all I see on my MS-Windows machine is slow scrolling (due to
linum-mode), but no redisplay problems.

> I have a screenshot of the bug occurring, but I'm not sure on the rules for 
> posting images here.

Please do post the screenshots.