Wrong glyphs for phonetic ligatures U+02A3 through U+02AB

[dscorbett]

• Your font version: 3.0.0-rc.6
• Your font variant: all
• Your operating system (name and version): macOS 10.14.6
• Your application using Iosevka: hb-view

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U+02A3 through U+02AB are rendered as digraphs, but they are supposed to be ligatures. For example, U+02A3 LATIN SMALL LETTER DZ DIGRAPH should not look like dz U+01F3 LATIN SMALL LETTER DZ. (The Unicode names are misleading.) Here they are in Iosevka Extended:

[be5invis]

How about this?

[be5invis]

t-esh is also modified to look connected.

[dscorbett]

In the new glyph of U+02A8 LATIN SMALL LETTER TC DIGRAPH WITH CURL, the bottom right end of the ⟨t⟩ protrudes slightly beyond the curl of the ⟨ɕ⟩. Was that intentional?

[be5invis]

@dscorbett These phonetic ligatures are built from the two parts so they may collide. Fixing that is too costy.

[be5invis]

By repeatedly knocking the second part this is now avoidable.

[throwaway571]

Glyph Design note: In the phonetic fonts I’ve come across, it’s the crossbar of the /t that reaches out and attaches to the /esh, not the exit stroke. The exit stroke may actually collide with the /esh, but only in proportional fonts when the spacing is too narrow. As for /ts and /tccurl, it might be possible for them to have two points of contact, one at the crossbar and one at the terminal.

Character Request note: There were two more IPA phonetic ligatures added in Unicode 12.0, U+AB66 and U+AB67. These are retroflex affricates attested in Chinese dialectology.

[be5invis]

[throwaway571]

@be5invis Because the exit stroke of the /t in /tesh isn’t touching the /esh anymore, you might want to consider adding an upward terminal to it to mirror /t itself.