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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Unicode combining characters
Date: Wed, 26 May 2021 15:54:43 +0300
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To: Anand Tamariya <atamariya@gmail.com>
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 (message from Anand Tamariya on Wed, 26 May 2021 15:21:05 +0530)
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> From: Anand Tamariya <atamariya@gmail.com>
> Date: Wed, 26 May 2021 15:21:05 +0530
> Cc: emacs-devel@gnu.org
> 
> Let's call the first character in the screenshot as shr (single glyph) and the second one as sh-r (two glyphs).
> (setq shr  (string 2358 2381 2352))
> (setq sh-r (string 2358 2352))
> 
> (string-width shr)  ;; 2
> (string-width sh-r) ;; 2

Sorry, it turns out I've misremembered: string-width doesn't account
for "automatic compositions", the ones that happen due to
composition-function-table (as opposed to "static compositions" which
happen due to the 'composition' text property).  So this case
currently cannot be handled correctly by string-width; we should fix
that.