Is this behaviour OK?

[Mercury13]

Title

Possible regression detected in Sutton, is it OK?

Font

NotoSansSignWriting-Regular.ttf

Where the font came from, and when

Site: this repo, beta branch
Date: 2023-04-27

Font Version

9c10f21

OS name and version

Probably all OS

Application name and version

Probably all apps

Issue

Is it regression?

1. 1DA04+Fill2
2. See two characters
3. Used to be one character

(Also some combinations stopped to work, but as my Unicodia has incomplete Sutton data, first I’ll improve it, then complain)

Character data

U+1DA01 SignWriting head movement-wallplane straight (Fill6 only)
…
U+1DA36 SignWriting air sucking in (Fill4…Fill6 only)
U+1DA3B SignWriting mouth closed neutral (Fill2 only)
…
U+1DA6C SignWriting excitement (all fills)
U+1DA75 SignWriting upper body tilting from hip joints (Fill6 only)
U+1DA84 SignWriting location head neck (all fills)

Screenshot

STABLE RELEASE

[simoncozens]

I'm not sure. It's possible that both old and new behaviours are wrong. The non-filled forms are supposed to either attach to a head or to a dotted circle, but then surely the filled/rotated forms should attach as well. I don't know why the filled and rotated forms are designed as spacing glyphs.

As a side note, this whole font really should be redesigned as a COLRv1 font. The fill and rotation glyphs could be implemented as colour layers. It'd look better, have a simpler rule set and a smaller glyphset.

[Mercury13]

In stable releases Sutton had NEVER attached to dotted circle.

[simoncozens]

I mean this, which is inconsistent:

[Mercury13]

Someday I’ll probably take original Slevinski’s font, and turn it to a working font.
If the only thing I know is FontForge → OK, it’s highly programmable.

[Mercury13]

@simoncozens , may I ask you a question?

I managed to assemble basic features in such a fashion.

What does 1DA01 + F6 do? You have made a spacing character, but I suspect it’s untrue. Maybe it’s a mark-over-mark?

[Mercury13]

Done almost all Unicodia Sutton font, including movement up/down!