> Mohammad Hossein Bateni <mailto:bateni@gmail.com>
> 22. August 2016 um 10:49
> Same problem, item (6) of email below, observed with arabtype font.  
> See attached.  MWE follows.
>
> \definefontfamily [myfamily] [serif] [arabictypesetting] [features=arabic]
> \setupbodyfont    [myfamily]
> \setupalign[r2l]
> \setupdirections[bidi=global,method=two]
>
> \setupmixedcolumns[register][direction=reverse]
When you have a font with large ascender/descender you can increase the 
linespacing (line key) or change the height/depth (height and depth 
keys) values for \strut.

\startsetups[register:interlinespace]
     \setupinterlinespace[height=0.6,depth=0.4,line=3.2ex]
\stopsetups

\setupmixedcolumns
   [index]
   [direction=reverse,
    setups=register:interlinespace]

Wolfgang