Trying to get the #din91379 sequences with horn to shape correctly in my Sudo fonts ... “S horncomb macroncomb” is an especially difficult combination. It shapes correctly in harfbuzz (FontGoggles, top) but not in CoreText (TextEdit, bottom). I wonder if that's a limitation in #GlyphsApp’s generated mark feature or a bug in CoreText. That one of the font is monospaced also doesn’t make it easier ;)
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... and soon after posting, I found a solution :) I read @simoncozens’ article “Advanced Glyph Reordering” (https://simoncozens.github.io/advanced-glyph-reordering/) and indeed, just swapping the horncomb and macroncomb makes all following steps easier, and makes it work in CoreText.
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@jenskutilek /horncomb is U+031B, the Vietnamese legacy character? Or are you talking about U+0315, the apostrophe-like upper right mark? CoreText has some assumptions about the latter that I experienced recently but have not fully explored.
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@TiroTypeworks It's U+031B, which should look like an apostrophe after the letter in this particular combinations in the transliteration standards that DIN91379 is based on (so @moyogo told me)
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@jenskutilek @TiroTypeworks sorry I wasn't clear in https://typo.social/@moyogo/113634181527763527. U+031B should attach, like with o and u. The issue was that U+0315 should float right like the apostrophe. I was confusing by mentioning the ISO transliterations seem to use either as if they were better characters than the apostrophe. But U+31B isn't better, especially since it should attach.
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@jenskutilek @TiroTypeworks For example, in ISO 11940, s̛̄ 0073+0304+031B is shown with an unattached U+031B COMBINING HORN. But by definition U+031B attaches to the letter. ISO 11940 is problematic, it confuses this faulty unattached combining horn for the traditional transliteration apostrophe.
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@moyogo @TiroTypeworks That’s the document I also looked at ... I decided that the horn shown there should probably look even more like an apostrophe, as it does in some fonts for the Vietnamese glyphs. But that would leave me with two different shapes for the horn.
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@jenskutilek @TiroTypeworks U+031B should connect to the letter, it’s Unicode character has that property. ISO 11940 and DIN 91379 should deal with that and not make U+031B yet another character for apostrophe.
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@moyogo @jenskutilek I wish U+031B didn’t exist. The Vietnamese letters with horn should not have had decompositions, and the horn shouldn’t be treated as a combining mark.
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text/gemini
