SpinBox minus isue with Persian Language

Hi ppl
I supported my project for Persian, by using linguist. I turned everything into Persian, even calender (not using the Gregorian). All works correct, but I have an isue with spinboxes.
At first I couldn't realise but when I wanted to write negative numbers, I couldn't.
When I set value by code it works, also when I use buttons to go negative, everything ok, even I can copy and paste.
But when I try to input on keyboard, after I write minus sign, can't write anything else. can't write letter by letter by keyboard (only negatives are problem).
I tried Arabic, it doesn't have the same isue, it is only for the Persian.
Do you have any idea or solution for this?