Windows: QWindow auto-test fails

After change http://codereview.qt-project.org/#change,20090 and its newly added auto-tests, tst_qwindow fails on event ordering. The platform plugin needs to make sure it sends a geometry event to a window before the first expose event gets sent, since the expose event is the cue to the application that it can start rendering.

Autotest `tst_qwindow' failed for win32-msvc2010 Windows 7

No platform plugin argument was specified, defaulting to "windows".
Testing tst_QWindow
FAIL! : tst_QWindow::eventOrderOnShow() 'window.eventIndex(QEvent::Resize) < window.eventIndex(QEvent::Expose)' returned FALSE. ()
tst_qwindow.cpp(152) : failure location
Totals: 15 passed, 1 failed, 0 skipped
QtQA::App::TestRunner: test failed, running again to see if it is flaky...
No platform plugin argument was specified, defaulting to "windows".
Testing tst_QWindow
FAIL! : tst_QWindow::eventOrderOnShow() 'window.eventIndex(QEvent::Resize) < window.eventIndex(QEvent::Expose)' returned FALSE. ()
tst_qwindow.cpp(152) : failure location
Totals: 15 passed, 1 failed, 0 skipped
QtQA::App::TestRunner: test failure could be reproduced twice consecutively