Hi Behdad, When (accidentally) testing fonts that has no OpenType tables with vocalized Arabic text, the fallback glyph positioning gives a funny Tetris-like patterns. I like it :) but may be HarfBuzz should give up on fallback positioning if the mark will end up as .notdef.
See the attached image using a special version of Libertine: http://khaledhosny.org/files/tmp/libertine_r-noot.otf Regards, Khaled
<<attachment: fallbak_positioning.png>>
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