Wrong display of Uyghur letter ھ ?

[sal-ammoniac]

Font

NotoNaskhArabic-Regular.ttf

Where the font came from, and when

For example:
Site: https://fonts.google.com/noto/specimen/Noto+Naskh+Arabic
Date: 2023-04-20

Font Version

Version 2.016

OS name and version

Windows 11 Version 22H2

Application name and version

Microsoft Edge Stable Version 113

Issue

The letter "ھ" in Uyghur will only show its isolated form even in medial and final form.
however,it should be showing "ـھـ" in its medial and final form.

[sal-ammoniac]

the letter is U+06BE ھ ARABIC LETTER HEH DOACHASHMEE

[simoncozens]

This appears to be by design, but I don't know if it's correct. The font does contain (and correctly display) medial, initial and final forms for heh doachashmee, but they are very similar to the isolated form (initial and medial forms do not have a raised "tail" at the exit stroke).

I'm not sure why the "figure eight" forms are not used in the medial/final.

[moyogo]

Unicode 14.0 and 15.0 updated the "Letter heh" paragraph with the following info and table relevant to 06BE:

U+06BE ARABIC LETTER HEH DOACHASHMEE is used to represent any heh-like letter that appears with left stems in all contextual forms. All four forms should have two horizontal or vertical “eyes.” The exact contextual shapes of the letter depend on the language and the style of writing. Four variations for knotted heh are shown in Table 9-9.

[simoncozens]

So we do have the medial form of heh which we could use here for medial hehDoachashmee, but obviously no final form. And the medial heh connection looks kind of weird on the left, but again maybe that's by design:

[sal-ammoniac]

So we do have the medial form of heh which we could use here for medial hehDoachashmee, but obviously no final form. And the medial heh connection looks kind of weird on the left, but again maybe that's by design:

But this will cause ambiguity between Uyghur "e" and "h".

[sal-ammoniac]

Many Turkic languages of Central Asia like Uyghur as well as Kurdish use the modification of the letter for front vowels [æ] or [ɛ]. This has its own code point (U+06D5). To distinguish it from Arabic hāʾ /h/ the letter lacks its initial and medial forms:

https://en.wikipedia.org/wiki/He_(letter)#Arabic_h%C4%81%CA%BE
https://www.unicode.org/L2/L2001/01270-report-06D5.pdf

[moyogo]

@sal-ammoniac Simon suggested using the medial form of U+0647 for the medial and final forms of U+06BE, and possibly adjusting the end stroke of the final form:

[r12a]

Hmm. If it will look like Myogo's example, it seems a bit clunky to me. Compare it with Scheherazade, where the final form has modulation similar to the isolate form.

[moyogo]

That’s how the letter is drawn though:

[moyogo]

Or it could be like this:

[sal-ammoniac]

that seems ok @moyogo