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

[Robert Dallas Gray <mail@robertdallasgray.com>]

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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.


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