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Re: Unicode confusables and reordering characters considered harmful

From: Eli Zaretskii
Subject: Re: Unicode confusables and reordering characters considered harmful
Date: Tue, 02 Nov 2021 21:51:44 +0200

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: stefan@marxist.se,  cpitclaudel@gmail.com,  emacs-devel@gnu.org
> Date: Tue, 02 Nov 2021 15:47:27 -0400
> > In most cases, there's no need to make these controls stand out,
> > because situations where this presents security risks are extremely
> > rare, to put it mildly, and OTOH having them stand out more by default
> > will make it harder to read text with completely legitimate uses of
> > these controls (example: TUTORIAL.he).
> Fully agreed.  That's the problem: how to define the problematic cases
> in a precise enough way that it doesn't rule out all lots of
> legitimate cases.

That's what bidi-find-overridden-directionality already does, albeit
not yet for the specific examples in that paper.  But Someone™ should
write a minor mode or an optional display feature which uses that
function to highlight the problematic stretches of text on display,
using the function's output for finding such stretches of text.

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