/uni1FC0 and /uni1FC1 have incorrect shapes

[glenda-tn]

According to the Unicode spec, these are the Greek Perisponeni and Greek Dialytika and Perispomeni, respectively.

In Ubuntu, they appear as:

1FC0 is used as a component in the following glyphs, which should have the tilde shape:
1FB6
1FB7
1FC6
1FC7
1FD6
1FE6
1FF6
1FF7

1FC1 is used as a component in the following glyphs, which should have the tilde over dieresis shape:
1FD7
1FE7

These are all part of the Greek Extended code page.

[djrrb]

Thanks for noticing this! While most fonts indeed have a more tilde-esque form like in the spec, Ubuntu seems to not be alone in using an inverted breve-style form, so this might be an accepted stylistic variant. So I’m going to hold off on making changes here until we get a second opinion.

[djrrb]

Thanks to Dyana for contacting Greek expert Irene Vlachou. We learned the following:

Perispomeni usually follows the shape of a tilde, but if the typeface is based on the Porson Greek model, then perispomeni looks like an inverted breve. In some rare occasions it appears straight like a macron.

Interesting to know this! Since the inverted breve is an accepted form, I’ll leave it as-is and close this issue.

[glenda-tn]

Fascinating! Thanks for looking into it!