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Re: Bidirectional text and URLs

From: Richard Stallman
Subject: Re: Bidirectional text and URLs
Date: Sun, 07 Dec 2014 19:26:33 -0500

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  > > If so, the questionis: once you detect the strangeness, what then?

  > It's up to the application.

Alas, that's ducking the issue.  We need to confront this issue.

  > That's easy: copy the text without the directional override and
  > display it in some other buffer.  The position returned by
  > bidi-find-overridden-directionality is of the 1st character following
  > the override control, so copying the text starting at that position
  > will exclude the override and avoid its effects.

That is the first magic bidi char, but there could be more.  It would
be necessary to remove them all.

However, is simply removing them correct?  In general, do magic bidi
characters get include in the URL that is passed to the browser?  I would 
expect so.

If so, a string which does not include them is inaccurate, and the
accurate thing to do is to include them and display them (perhaps in
hex) while suppressing their bidi effect.

Also, don't some RTL characters cause some normally LTR characters to
display RTL?  That too could cause confusion, right?

Dr Richard Stallman
President, Free Software Foundation
51 Franklin St
Boston MA 02110
www.fsf.org  www.gnu.org
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