Wrong sequence for Arabic ligature marks(FC5E-FC62, FCF2-FCF4)

[Ken Whistler]

On 2/17/2022 8:44 PM, Saeed Hubaishan via Unicode wrote:
> Hi,
> "The Decomposition Type Mapping"  of these ligature marks are worng:
> |FC5E| 	 ‎ﱞ‎ 	Arabic Ligature Shadda With Dammatan Isolated Form
> 		≈ 	<isolated> |0020| ␣ |064C| ◌ٌ |0651| ◌ّ
> |FC5F| 	 ‎ﱟ‎ 	Arabic Ligature Shadda With Kasratan Isolated Form
> 		≈ 	<isolated> |0020| ␣ |064D| ◌ٍ |0651| ◌ّ
>
>
...
> Arabic Shadda must be before the marks (||064C| ◌ٌ ,|064D| ◌ٍ , 
> |064E| ◌َ| ,|064F| ◌ُ ||, |0650| ◌ِ)
>
Decompositions are immutable, constrained by normalization stability.


To see how such rendering should be handled, instead, please see Unicode 
Technical Report #53, Unicode Arabic Mark Rendering, which addresses the 
issue of the placement of shadda, along with many other issues of 
ordering and placement of various tashkil, ijam, and other marks:


https://www.unicode.org/reports/tr53/


--Ken
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