QPainter::drawText() fails to draw correct text in some circumstances.Related to QTBUG-12950

clip rect is 0, 0, 128, 39.
rect is 4, 4, 120, 31
font is current system font (liberation sans, size=9).

painter.drawText(rect, Qt::AlignLeft | Qt::AlignVCenter | Qt::TextWordWrap, 
tr("Save project\nCtrl + S"));

Draws
--------
Save
project
---------

But should be
----------------
Save project
Ctrl + S
----------------

Same code works ok with qt-4.6.3, but not with qt-4.7.1 (don't know about 
4.7.0). Tested on linux (fedora 14), Fedora 13 = qt-4.6.3.Don't know if other platforms are
affected with this bug.

Problem exists if first line contains < 3 spaces and line feed and flags 
contains Qt::TextWordWrap .
eg. 'Save project\nCtrls + S' - BAD
eg. 'Save project with\nCtrls + S' - BAD
eg. 'Save project with keys\nCtrl + S' GOOD

Note that without Qt::TextWordWrap everything works fine.