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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Pretest begins end-June
Date: Tue, 31 May 2011 05:03:41 -0400
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> From: David Kastrup <dak@gnu.org>
> Date: Tue, 31 May 2011 09:50:31 +0200
> 
> IIRC, by far the worst contender for confusing the display engine
> was when the text hidden by the display string contained newlines,

I'm not surprised.  Newlines in the buffer serve as anchors for the
display engine when it moves non-linearly, e.g. goes back by N lines.
Handling the case where a newline does not indicate a beginning of a
new screen line is painful and tricky.

> Newlines.  And now we are talking about R2L.

Well, at least with R2L users can turn off the reordering if it
happens to screw them up too badly.