New to Typophile? Accounts are free, and easy to set up.
Peace be on All Friends,
In VOLT, Marks Positioning is carried out Independently for each letter and for each component of every ligature?!
So, to avoid the Collision of Marks with Marks and/or Letters in Arabic Fonts:
1 The thinest letter or ligature should be at least a bit wider than the widest mark. Just like asking 3 cowboys to stand side by side without allowing their Hats to collide. And this can be done at the expense of Beauty.
2 Marks should be horizontally centered on top of or below each letter and each component of every ligature. And this is not always possible even if Beauty is sacrificed.
Samples speak louder than words?!