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

[Robert Dallas Gray]

On 31 Aug 2012, at 10:05, Eli Zaretskii wrote:

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?

It stays corrupted until the next scroll (or M-x redraw-display, or a window resize).

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

I wasn't able to reproduce it in Emacs 24.1 on Windows 7.

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.

Attached.