U+11D8A GUNJALA GONDI VOWEL SIGN AA disappears contextually

[dscorbett]

Font

NotoSansGunjalaGondi-Regular.otf

Where the font came from, and when

Site: https://github.com/googlefonts/noto-fonts/blob/115d38430d957d38307457c036302b7bdbe0bbc4/phaseIII_only/unhinted/otf/NotoSansGunjalaGondi/NotoSansGunjalaGondi-Regular.otf
Date: 2020-04-12

Font version

Version 1.001

Issue

U+11D8A ā disappears before U+11D93 ō and U+11D94 au. These sequences should never occur: this bug hides typos.

Character data

𑵬𑶊𑶓𑵬𑶊𑶔
U+11D6C GUNJALA GONDI LETTER YA
U+11D8A GUNJALA GONDI VOWEL SIGN AA
U+11D93 GUNJALA GONDI VOWEL SIGN OO
U+11D6C GUNJALA GONDI LETTER YA
U+11D8A GUNJALA GONDI VOWEL SIGN AA
U+11D94 GUNJALA GONDI VOWEL SIGN AU

Screenshot

[simoncozens]

I don't think this is quite true. This graphic shows letter ya, ya+aa, ya+aa+oo. (𑵬 𑵬𑶊 𑵬𑶊𑶓)

The aa matra is still present in the third sequence.

[dscorbett]

The strings <U+11D6C, U+11D8A, U+11D93> and <U+11D6C, U+11D93> both produce the glyph sequence <YaMatraAa.GGondi, MatraEe.GGondi>, and similar for U+11D94. The bug is that U+11D8A is suppressed. It should look like this:

That rendering looks wrong, which is appropriate because the input character sequence is wrong.

[simoncozens]

Oh, I see, the -OO is being converted into -AA -EE, and the way that this is applied assumes that there isn't already an -AA there. I get it now.