I found that changing the alignment of a text object does not work properly if the text contains newline characters. I've attached a simple test case that shows the problem. If I set the text AFTER setting the alignment, everything works fine. But if I set the text BEFORE setting the alignment then the text is displayed incorrectly.
The fix is very simple. Instead of calling computePositions() in TextBase::setAlignment(), it calls computeGlyphRepresentation(). I've attached the modified TextBase.cpp."