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Re: bidi-display-reordering is now non-nil by default

From: Stefan Monnier
Subject: Re: bidi-display-reordering is now non-nil by default
Date: Sat, 27 Aug 2011 22:52:00 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

>> So embeddings should not be used too much, and/or should only be used
>> dynamically (jit-lock-style) and implicitly (e.g. not copied by
>> kill-region).
> It depends.  If only part of the embedded text is copied, then the
> directional formats should be dropped, indeed.  But if all of it is
> copied, they should be kept, to preserve the visual appearance.

Sounds difficult to implement reliably.

> So I guess we will need to set filter-buffer-substring-functions to
> something non-nil by default?  Or maybe modify filter-buffer-substring
> itself to remove these characters as needed?

Maybe that can be made to work, but we'd need to add a corresponding
filter-substring, and I'm not sure that we wouldn't get into bugs where
we need to change the code from buffer-substring to


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