[autotests] tst_qmenubar fails too often in CI

The tst_qwidget autotest has failed 18 times in CI between April 9. to April 29., 2013, and ranks as one of the top most failing test in that time frame. It seems likely that the test needs fixing.

Most common failures:

• tst_QMenuBar::task256322_highlight() Compared pointers are not the same
• tst_QAbstractItemView::testNoActivateOnDisabledItem() 'QTest::qWaitForWindowActive(&treeView)' returned FALSE. ()

See more info in the test results:

FAIL! : tst_QMenuBar::task256322_highlight() Compared pointers are not the same
http://testresults.qt-project.org/ci/Qt5_stable_Integration/build_00179/macx-clang_developer-build_qtnamespace_OSX_10.7/log.txt.gz
http://testresults.qt-project.org/ci/Qt5_stable_Integration/build_00181/macx-clang_developer-build_qtnamespace_OSX_10.7/log.txt.gz
http://testresults.qt-project.org/ci/Qt5_dev_Integration/build_00108/macx-clang_developer-build_qtnamespace_OSX_10.7/log.txt.gz
http://testresults.qt-project.org/ci/QtBase_stable_Integration/build_00918/macx-clang_developer-build_qtnamespace_OSX_10.7/log.txt.gz
http://testresults.qt-project.org/ci/QtBase_stable_Integration/build_00924/macx-clang_developer-build_qtnamespace_OSX_10.7/log.txt.gz
http://testresults.qt-project.org/ci/Qt5_stable_Integration/build_00207/macx-clang_developer-build_qtnamespace_OSX_10.7/log.txt.gz
http://testresults.qt-project.org/ci/Qt5_stable_Integration/build_00208/macx-clang_developer-build_qtnamespace_OSX_10.7/log.txt.gz
http://testresults.qt-project.org/ci/Qt5_stable_Integration/build_00209/macx-clang_developer-build_qtnamespace_OSX_10.7/log.txt.gz
http://testresults.qt-project.org/ci/Qt5_stable_Integration/build_00210/macx-clang_developer-build_qtnamespace_OSX_10.7/log.txt.gz
http://testresults.qt-project.org/ci/Qt5_stable_Integration/build_00211/macx-clang_developer-build_qtnamespace_OSX_10.7/log.txt.gz
http://testresults.qt-project.org/ci/Qt5_stable_Integration/build_00214/macx-clang_developer-build_qtnamespace_OSX_10.7/log.txt.gz

FAIL! : tst_QAbstractItemView::testNoActivateOnDisabledItem() 'QTest::qWaitForWindowActive(&treeView)' returned FALSE. ()
http://testresults.qt-project.org/ci/QtBase_dev_Integration/build_00819/macx-clang_developer-build_qtnamespace_OSX_10.7/log.txt.gz

FAIL! : tst_QAbstractItemView::QTBUG6407_extendedSelection() 'QTest::qWaitForWindowActive(&view)' returned FALSE. ()
http://testresults.qt-project.org/ci/QtBase_dev_Integration/build_00821/macx-clang_developer-build_qtnamespace_OSX_10.7/log.txt.gz