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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: bug#50951: Fwd: bug#50951: 28.0.50;
 Urdu text is not displayed correctly
Date: Sat, 02 Oct 2021 19:09:54 +0300
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To: Rah Guzar <aikrahguzar@gmail.com>
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 (message from Rah Guzar on Sat, 2 Oct 2021 18:06:09 +0200)
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> From: Rah Guzar <aikrahguzar@gmail.com>
> Date: Sat, 2 Oct 2021 18:06:09 +0200
> Cc: 50951@debbugs.gnu.org
> 
>  What kind of issues did you have in mind?
> 
> This might be me not understanding how required characters work but if a user sets a font
> for only Arabic (not Urdu) and the font doesn't have these characters, will it cause emacs
> to use a fallback for Arabic text? Or is the restriction only relevant for the selection of implicit
> fallback?

No, if the user customizes the fontset, the font specified there will
be used, no questions asked.  The representative characters are only
used for selecting the fonts by default.  AFAIK, at least.