Regression: Graphics composistion problems with qmlviewer on N900

Starting around May 20th, running a QML application (with the -opengl flag) on a N900 with
PR1.2 using the qmlviewer and Qt 4.7 binaries compiled from here
http://scm.dev.nokia.troll.no/projects/qt/repos/qt-maemo-shared/logs/4.7-fremantle
there are problems with the graphics composition.

When the application is started from the XTerminal it initially does not draw at all. One has to
force a full-screen recomposition by toggling the screen-lock key, after witch it works fine. If
one then switch away from the QML app and back via the app-switcher, the QML app is
drawn off-center and cropped, and frozen. Toggling the screen-lock key again resolves the
problem.