TATWEEL and HAMZA ABOVE break lam-alef ligature

[adamiturabi]

In some words, hamza is properly written above the horizontal connecting line. Examples:

This is input by U+0640 Tatweel followed by U+0654 Hamza above. Technically, Unicode should have provided a better, more semantic, way for inputing this but there is no spec/encoding so far.

This Tatweel->Hamza above technique works well for most words. However, sometimes the hamza comes between a lam and alef. In this case it should not break the lam-alef ligature. Example:

[rastikerdar]

Sorry for late answer.
Thanks for this issue. You are right. It should be fixed.

[adamiturabi]

Thank you very much for considering this enhancement.

Since this issue was opened, I thought of a (hopefully) better way to handle this case, using uni034F "Combining Grapheme Joiner" (CGJ).

It is discussed here:
aliftype/amiri#217 (comment)

Using CGJ both hamza and dagger alef (uni0670) can be handled in a consistent manner.

I will also try to create a formal Unicode proposal for this soon.

Thanks again!