[glyphdata] Custom data should fallback to default for missing glyphs

googlefonts / glyphsLib

A bridge from Glyphs source files (.glyphs) to UFOs

Apache License 2.0

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[glyphdata] Custom data should fallback to default for missing glyphs #989

Closed khaledhosny closed 4 months ago

khaledhosny commented 4 months ago

When using custom GlyphData, we should fallback to default GlyphData for missing glyphs. This matches what GlyphsApp does, and allow overriding only a subset of the glyphs in the font.