Hence the design of Latin glyphs is planned with 16 degree angle, while the Arabic glyphs are constrained to a minus 16 degree angle, Is it possible to have in the same Glyphs file two mirrored angles: one for LTR and the other for RTL ?
Yes. With the italicAngle parameter in your masters. Use arabic:-16 as value.
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OK I will test that
Thanks
It works perfectly 
Ich bin dankbar
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Is it okay if I set this metric in Font Info → Masters?
Are there any possible pitfalls after export?
All metrics with filters are ignored right now as there is no place to put them. So they are only a guide while drawing.
Right, I remember we talked about it on another topic. As I understand it, at the export there will be just 12 degrees italic angle (my first metric without a filter), and even then, left slanted Arabic letters will be connected correctly. I’ll check it soon.
The italic angle doesn’t do anything except maybe to tilt the cursor.
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