Noto Nastaliq Urdu: Regression in swash seen/sheen

[saadatm]

Fonts

NotoNastaliqUrdu-Regular.ttf
Came from: https://github.com/googlefonts/noto-fonts/blob/f01b460a7125a4025988a59e0616973ce9eb91c5/unhinted/ttf/NotoNastaliqUrdu/NotoNastaliqUrdu-Regular.ttf
Version: 3.002

NotoNastaliqUrdu-Regular.ttf
Came from: https://github.com/googlefonts/noto-fonts/blob/d5aa70fe8b425321411bb92d5cc901f87ac727b9/unhinted/ttf/NotoNastaliqUrdu/NotoNastaliqUrdu-Regular.ttf
Version: 3.003

Issue

The swash variants of U+0633 ARABIC LETTER SEEN (س) or U+0634 ARABIC LETTER SEEN (ش) (originally reported in #46) were fixed in notofonts/noto-source@88c7d85. However, this introduced a regression for the following sequences:

سس شش
سسر ششر

Screenshots

v3.002 (swash correctly appearing):

v3.003 (swash not appearing anymore):

[simoncozens]

Kamal Mansour has provided a fix for this. I just haven't had time to review/PR it. :-(