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googlefonts / science-gothic

Science Gothic, a libre variable font
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Kern feature fail? #338

Closed kateliev closed 2 months ago

kateliev commented 2 months ago

today while generating the instances needed for #301 i stumbled upon the following major bug: Kerning is utterly broken for all /l combinations with not apparent reson.

image

The glyph is not present in ANY kern class, nor has any kern values attached even as simple glyph to glyph nor glyph to class pairs. This puzzles me! Examined all the auto-generated features but to no luck. Finally started removing feature by feature from the font ... finally arrriving at the conclusion that removing the ordn feature fixes the problem?! Which is even more puzzling...

feature ordn {
# Ordinals

#> feature
  sub [zero one two three four five six seven eight nine] [A a]' by ordfeminine;
  sub [zero one two three four five six seven eight nine] [O o]' by ordmasculine;
  sub N o period by uni2116;
#< feature
} ordn;

Removing the feature apparently fixes the bug?! so i will keep it that way for a while, just to be sure that the exported TTFs are usable! image

To be investigated!

kateliev commented 2 months ago

Hmm scratch that... this sounds more like mkmk and mark features failing...

kateliev commented 2 months ago

This seems more and more like FL bug :(

kateliev commented 2 months ago

Defiantly FL bug. Generated using UFO+fontmake = ZERO bugs!!! Closing...