Tested with 8.0 b91. Create some TextField/TextArea with mixed text (arabic + other characters), check the caret movement when pressing left/right/home/end keys.
There is a couple of issue:
1. For symbol + arabic, like *#@ عشرة , in "*#@", when pressing right arrow key, caret move from right to left and vice versa.
2. For arabic + hindi, like عشرة हिंदी , at the beginning of hindi, when pressing right arrow key, caret doesn't move.

Attached a test program.