Zero-Width Joiner U+200D

[Asmus Freytag]

On 2/21/2023 12:20 AM, Andreas Prilop via Unicode wrote:
> I think that
>
>      U+FECC
>      medial ain
> and
>      U+200D U+0639 U+200D
>      ZWJ, ain, ZWJ
>
> should look the same, regardless of surrounding text and direction.
> Is this correct?
> Some programs (such as Firefox) display them differently;
> see the attached HTML file.

Generally, surrounding a character with ZWJ should lead to it being 
rendered with its medial form.

Text direction should have nothing to do with shaping, and shaping 
context should not extend across ZWJ. That's my understanding as well, 
but maybe somebody can throw some light on this issue.

A./
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