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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Possible new display bug
Date: Sat, 01 Oct 2011 20:53:56 +0300
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To: Lars Magne Ingebrigtsen <larsi@gnus.org>
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> From: Lars Magne Ingebrigtsen <larsi@gnus.org>
> Cc: emacs-devel@gnu.org
> Date: Sat, 01 Oct 2011 18:36:12 +0200
> MailScanner-NULL-Check: 1318091775.61063@wbRskF8kn+B91ur5w1lehw
> 
> It finally happened again.  `M-x redraw-display RET' fixed the issue.
> 
> So Emacs is not redrawing certain parts of the display?

It probably means Emacs is employing some redisplay optimization when
it shouldn't.

> It seems to be reproducible for me right now, but it involves using
> Gnus to view blog items that have images in them.

If you can make a reproducible test case starting from "emacs -Q", I
could try looking into it.