Domine ^ is zero-width

[rsheeter]

https://fonts.google.com/specimen/Domine?preview.text=This%20is%20probably%20broken%20-%20%5E%5E%5E%5E%5E%5E%5E%5E%5E%5E%20-%20...and%20after

$ /oss/harfbuzz/build/util/hb-shape --text "^"  /oss/fonts/ofl/domine/Domine\[wght].ttf 
[asciicircum=0+0]

Suggests a collection scope check. My naive formulation was if most fonts that support a grapheme have it not-zero-width and a few have it zero that's suspect. @simoncozens suggested base glyphs shouldn't be zero width is also valid.

[kenmcd]

asciicircum advance width on the Regular is 382.
But it is marked as a non-spacing mark.
If you change it to a Base it appears correctly.

[simoncozens]

I constructed a quick fontspector check which looks for

• encoded glyphs
• with advance width 0
• which are not GDEF non-spacing marks
• and which don't have Unicode categories Space Separator, Line Separator, Paragraph Separator, Format, Control or Nonspacing Mark.

We have 615 fonts in the collection which fail this check.