[autotests] tst_qwidget fails too often in CI

The tst_qwidget autotest has failed 16 times in CI between 2013-03-25 and 2013-04-8, and ranks as one of the top most failing test in that time frame. It seems likely that the test needs fixing.

See more info about the most common failures in the following test results:

tst_QWidget::scroll() Compared values are not the same

• http://testresults.qt-project.org/ci/QtBase_dev_Integration/build_00720/linux-g++-32_developer-build_Ubuntu_10.04_x86/log.txt.gz
• http://testresults.qt-project.org/ci/QtBase_dev_Integration/build_00719/linux-g++-32_Ubuntu_10.04_x86/log.txt.gz
• http://testresults.qt-project.org/ci/QtBase_dev_Integration/build_00714/linux-g++-32_developer-build_Ubuntu_10.04_x86/log.txt.gz
• http://testresults.qt-project.org/ci/QtBase_dev_Integration/build_00709/linux-g++-32_developer-build_Ubuntu_10.04_x86/log.txt.gz
• http://testresults.qt-project.org/ci/QtBase_dev_Integration/build_00721/linux-g++-32_Ubuntu_10.04_x86/log.txt.gz
• http://testresults.qt-project.org/ci/QtBase_dev_Integration/build_00722/linux-g++-32_developer-build_Ubuntu_10.04_x86/log.txt.gz
• http://testresults.qt-project.org/ci/QtBase_dev_Integration/build_00724/linux-g++-32_Ubuntu_10.04_x86/log.txt.gz
• http://testresults.qt-project.org/ci/QtBase_dev_Integration/build_00726/linux-g++-32_Ubuntu_10.04_x86/log.txt.gz

tst_QWidget::moveChild(<ALL DIRECTIONS>) Compared values are not the same

• http://testresults.qt-project.org/ci/QtBase_dev_Integration/build_00725/linux-g++_developer-build_qtnamespace_qtlibinfix_Ubuntu_11.10_x64/log.txt.gz
• http://testresults.qt-project.org/ci/QtBase_stable_Integration/build_00779/linux-g++_developer-build_qtnamespace_qtlibinfix_Ubuntu_11.10_x64/log.txt.gz

tst_QWidget::showAndMoveChild() Compared values are not the same

• http://testresults.qt-project.org/ci/QtBase_dev_Integration/build_00725/linux-g++_developer-build_qtnamespace_qtlibinfix_Ubuntu_11.10_x64/log.txt.gz
• http://testresults.qt-project.org/ci/QtBase_stable_Integration/build_00779/linux-g++_developer-build_qtnamespace_qtlibinfix_Ubuntu_11.10_x64/log.txt.gz