QIcon::fromTheme returns pixmaps that are bigger than requested

The icon engine behind icons that are loaded from QIcon::fromTheme does not scale any pixmaps that it returns. When using an icon theme with an incomplete set of icons (for example, only a "128x128" folder), QIcon::pixmap will always return 128x128 pixmaps even if you ask for one of size 22x22.

This is contrary to the QIcon::pixmap documentation that says "The pixmap might be smaller than requested, but never larger."

This causes icons in my application to appear too large for users that have custom icon themes:
http://code.google.com/p/clementine-player/issues/detail?id=1128
http://code.google.com/p/clementine-player/issues/detail?id=1057
http://code.google.com/p/clementine-player/issues/detail?id=707
http://code.google.com/p/clementine-player/issues/detail?id=480

I've made a patch to make QIcon scale down icons that it loads from themes the same as it does to other icons. Merge request is here:
http://qt.gitorious.org/qt/qt/merge_requests/2566