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Re: Unicode confusables and reordering characters considered harmful

From: Dmitry Gutov
Subject: Re: Unicode confusables and reordering characters considered harmful
Date: Wed, 10 Nov 2021 18:47:12 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0

On 02.11.2021 15:57, Vasilij Schneidermann wrote:
The first issue is about bidirectional reordering characters. If bidi
text rendering is not needed, it's easy enough to work around with
`(setq-default bidi-display-reordering nil)`. Some people already make
use of this to speed up redisplay. Maybe there's a better solution, such
as automatically detecting whether the user is working with a RTL script
and only then enable bidi text rendering.

The second issue is about mixed-script confusable characters. Emacs does
not appear to have a workaround for that. I've come across the
uni-confusables package in GNU ELPA, but it merely sets up character
tables. The only mention of confusables I can find in the Emacs sources
is for `help-uni-confusables` which contains a much smaller list for
quotation marks, used in help buffers and elisp buffers. A
possible solution would be to implement the Unicode confusables
algorithm and expose it in the uni-confusables package.

Here's also an article from yesterday focusing on _invisible_ characters:


AFAICS it hasn't been mentioned in this thread yet.

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