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[feaLib] pad a short OS/2 Vendor with spaces - #4259
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anthrotype merged 1 commit intoOct 8, 2026
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table OS/2 { Vendor "AB"; } OS/2;sets achVendID to "AB", which sstruct packsas b"AB\x00\x00". The OpenType spec says a Tag is padded with trailing spaces
(0x20), and #3280 settled that the producer should pad the vendor ID with spaces
rather than fontTools changing the OS/2 packing.
feaLib is such a producer, so it now pads the Vendor string to four characters
with spaces. A four-character vendor such as "ADBE" (spec9f.fea) is unchanged.
Added a test.