Hi Behdad:
When i try to draw the text "U+0628,U+06C2,U+06C2,U+0020" with harfbuzz, i find 
it is rendered differently  in windows 7. please see attachment file. After 
checking the hb-ot-shape-complex-arabic-table.hh, I found U+06C2 joining type 
was JOINING_TYPE_D (double joining).  I don’t know why Unicode specifies it 
double joining, it really does not make any sense. At least, when render the 
text, it should be treated as single joining type.
 
Br,
Dean
   





 
                                          

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