Problems with drawing Arabic letters on QTextLayout

When using arabic fonts in a QTextLayout then the arabic characters are not drawn in the right place, this especially happens when spaces are used as part of the text.

The example app shows the letters in a QTextLayout and the rectangle using boundingRect(), note in the case with only one character it is fine (it is rendered to the far left of the widget) in the other case it has a gap even though the string starts in the same way.

Tested with latest 4.7.x