Qt-4.4.x: Alternating row color problem on Mac

With recent versions of Qt QTreeView::setAlternatingRowColors(true) will paint alternating colors to the entire viewport on Mac, but not on other platforms.

To reproduce this, add one line to main.cpp in simpletreemodel example:
view.setAlternatingRowColors(true);

This "to the bottom" style is in line with modern mac application, such as itunes, but it would be nice if there was an easy way to limit the alternating rows to the ones that had content.