Initial and medial <mem, lesh> could be improved

[dscorbett]

Font

NotoSerifOldUyghur-Regular.otf

Where the font came from, and when

Site: https://github.com/notofonts/old-uyghur/releases/tag/NotoSerifOldUyghur-v1.004
Date: 2024-06-17

Font version

Version 1.004

Issue

The initial <mem, lesh> ligature should have two triangles for the lesh part, not one. See L2/20-191 § 5.1.14 which shows initial <kaph, lesh>, <mem, lesh>, and <pe, lesh>: only in <mem, lesh> does the lesh have two triangles (because it is a medial lesh) whereas in the other two ligatures it has one (because it is graphically an initial lesh in those contexts).

The medial mem’s swash is currently so short it doesn’t look like it needs to ligate with a following lesh, but the examples in the Unicode proposal all show a swash reaching below the following letter, so perhaps they should ligate, at least in the style used in this font. In all other positions, they ligate.

Character data

𐽹𐾁‌𐽹𐾁𐽹𐾁𐽹𐾁
U+10F79 OLD UYGHUR LETTER MEM
U+10F81 OLD UYGHUR LETTER LESH
U+200C ZERO WIDTH NON-JOINER
U+10F79 OLD UYGHUR LETTER MEM
U+10F81 OLD UYGHUR LETTER LESH
U+10F79 OLD UYGHUR LETTER MEM
U+10F81 OLD UYGHUR LETTER LESH
U+10F79 OLD UYGHUR LETTER MEM
U+10F81 OLD UYGHUR LETTER LESH

Screenshot