bug#53625: 28.0.91; Incorrect Malayalam font rendering

[Eli Zaretskii]

> From: Sameer Singh <lumarzeli30@gmail.com>
> Date: Sat, 29 Jan 2022 23:07:58 +0530
> 
> Emacs is unable to properly render a Malayalam font when a Virama is
> applied to a consonant with a diacritic. Instead of appearing with the
> consonant, it is displayed separately.
> Steps to Reproduce:
> 1. emacs -Q
> 2. In the scratch buffer type any malayalam consonant with a diacritic
> and a virama. e.g. : കാ്, കെ്, കൈ്
> 3. Instead of appearing on the consonant, the Virama appears separately
> with a dotted circle
> 
> I am using the "Baloo Chettan 2" font, but the issue is appearing with other
> fonts also.
> I have attached the correct render from "hb-view" in the file "mal.png", and 
> the incorrect
> render from emacs in the file "mal-emacs.png"

Thanks, should be fixed now on the emacs-28 branch.