Below-base diacritics are positioned like ogonek in Noto Serif

[dscorbett]

Font

NotoSerif-Regular.ttf

Where the font came from, and when

Site: https://github.com/googlefonts/noto-fonts/blob/3c11ad382eb71f5700368ccb7ca0e6ebd078684f/phaseIII_only/hinted/ttf/NotoSerif/NotoSerif-Regular.ttf
Date: 2020-07-19

Font version

Version 2.003; ttfautohint (v1.8.2)

Issue

In Noto Serif, the ogonek shares its anchor point with other below-base diacritics. On U+0041, U+0061, U+0075, and U+2090 (plus U+0104 and U+0105 when the language system is Navajo) the anchor point is shifted right. This is appropriate for the ogonek but not for other diacritics like U+0329, which should be centered.

Character data

U+0041 LATIN CAPITAL LETTER A
U+0329 COMBINING VERTICAL LINE BELOW
U+0061 LATIN SMALL LETTER A
U+0329 COMBINING VERTICAL LINE BELOW
U+0075 LATIN SMALL LETTER U
U+0329 COMBINING VERTICAL LINE BELOW
U+2090 LATIN SUBSCRIPT SMALL LETTER A
U+0329 COMBINING VERTICAL LINE BELOW
U+0104 LATIN CAPITAL LETTER A WITH OGONEK
U+0329 COMBINING VERTICAL LINE BELOW
U+0105 LATIN SMALL LETTER A WITH OGONEK
U+0329 COMBINING VERTICAL LINE BELOW

Screenshot

[nizarsq]

I was able to reproduce reported issue in NotoSerif.
@dscorbett any concern about:
1- U+0104 and U+0329 have overlap (when the language is Navajo) in NotoSans-Regular and NotoSans-Italic
2-U+0105 and U+ 0329 have overlap (when the language is Navajo) in NotoSansMono

[dscorbett]

I’m planning to make a separate issue for the overlapping diacritics in Navajo.

[Linguistx]

I'm seeing a lot of issues with a and u with the following combining symbols on NotoSerif-Regular.ttf

U+0324
U+031D
U+0318
U+031E
U+031F
U+0319
U+0320
U+0339
U+031C
U+0329
U+0330
U+0325
U+032F

a̤ ṳ a̟ u̟ a̘ u̘ a̞ u̞ a̝ u̝ a̠ u̠ a̙ u̙ a̜ u̜ a̹ u̹ a̩ u̩ a̰ ṵ ḁ u̥ a̯ u̯

Screenshot:

[Linguistx]

Any update on this one?