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Re: Adjust point to move it off zero-width characters

From: Stefan Monnier
Subject: Re: Adjust point to move it off zero-width characters
Date: Mon, 08 Aug 2011 00:12:54 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

>> That was my impression as well: the fusing should not always be done
>> in the same direction.  I'd still like to hear your reasoning about
>> why it only depends on the particular zero-width char and not on the
>> surrounding context.
> I explained that, for the directional control characters: the need to
> be able to interactively copy/paste text and be sure it displays the
> same.  The directional controls affect the _following_ characters.  If
> we "fuse" LRM/RLM/LRO/RLO/LRE/RLE with the previous character, they
> can only be copy/pasted with the text that precedes them, where they
> have no effect whatsoever.  That's why PDF is different: it affects
> the characters that precede it.

Ah, so they're kind of like combining characters.  Good.
In that case I think hardcoding PDF in the code is perfectly acceptable,
with a commend explaining what's going on.


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