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Re: Pretest begins end-June

From: David Kastrup
Subject: Re: Pretest begins end-June
Date: Tue, 31 May 2011 11:11:03 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

Eli Zaretskii <address@hidden> writes:

>> From: David Kastrup <address@hidden>
>> 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.

Unless the screwup asserts itself in the form of an infloop.  Anyway, as
opposed to normal R2L rendering, it is rather unlikely that display
strings and overlays will happen without some explicit user request
being involved.

David Kastrup

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