Khaled Hosny eb93b7688e [feaLib] Fix handled of "ignore" with unmarked glyphs
Fixes https://github.com/fonttools/fonttools/issues/2949

- If there are no marked glyphs in an "ignore" statement, issue a
  warning. The spec disallows this but makeotf allows it. It is most
likely a typo, so a warning is warranted.
- Mark the first glyph not all the glyphs, this matches makeotf.
- In asFea() always mark the input glyph.
- Udpate the tests.
2023-01-10 16:26:12 +02:00

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@LETTER_A = [A A.sc A.alt1];
feature test {
ignore sub A';
sub @LETTER_A' by a;
} test;