RightToLeft lookup flag

Sometimes when Glyphs generates lookup for Arabic, it adds RightToLeft to lookup flags. This is however is both unnecessary and misleading. The only lookups where this flag make a difference is cursive attachment lookups and has no relation to text direction. From the spec:

This bit relates only to the correct processing of the cursive attachment lookup type (GPOS lookup type 3). When this bit is set, the last glyph in a given sequence to which the cursive attachment lookup is applied, will be positioned on the baseline.
Note: Setting of this bit is not intended to be used by operating systems or applications to determine text direction.

I suggest that Glyphs stops adding this flag to Arabic lookups as it just confuses people thinking it makes a difference.

1 Like

Thanks for the feedback. I’ll change it.

Fixing something by deleting stuff is the best.