Two bugs with Arabic text in QTextEdit (?)

I am not a QT developer, and I don't know much about the QT framework.
However, I think I may have found a couple of bugs in QTextEdit. I have experienced exactly the same bugs in two QT-based word processors, i.e. FocusWriter and TextRoom, and both use QTextEdit.

1) with Arabic text: while the cursor is at the first (right-most) character of the line, the arrow key (up) sometimes does not work. That is, when it reaches a certain line, the cursor stops moving up, despite the fact that I keep pressing the arrow UP key. Then, if i move the cursor to the next character position in the line and press the arrow up key, it works fine. As far as I can tell, this problem occurs only when the cursor is at the first character of the line. I was not able to understand why it happens only with some lines and not with others. I have no idea if this happens with English text too.

2) with Arabic text: when selecting a text, the first letter is only partially highligted. That is, the first half of the letter is not highlighted and the second half is.

Could someone please look into this matter and check if these are indeed bugs in QTextEdit?