Top flaky test: tst_qwidget::showAndMoveChild

Test case: tst_qwidget::showAndMoveChild has failed 7 times and was flaky 0 times last week.

Coin log excerpt from failed run:
agent:2024/09/07 09:41:55 build.go:404: 571: QDEBUG : tst_QWidget::showAndMoveChild() qt.widgets.focus: Initializing focus chain of QWidget(0x16b9c9420)
agent:2024/09/07 09:42:00 build.go:404: 571: FAIL! : tst_QWidget::showAndMoveChild() 'QTest::qWaitForWindowActive(&parent)' returned FALSE. ()
agent:2024/09/07 09:42:00 build.go:404: 571: Loc: [/Users/qt/work/qt/qtbase/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp(6717)]
agent:2024/09/07 09:42:00 build.go:404: 571: QDEBUG : tst_QWidget::showAndMoveChild() qt.widgets.focus: QWidget(0x16b9c9420) wasn't removed, because it is not part of a focus chain.
agent:2024/09/07 09:42:00 build.go:404: 571: SKIP : tst_QWidget::subtractOpaqueSiblings() QTBUG-52974: Cocoa only has rect granularity.
agent:2024/09/07 09:42:00 build.go:404: 571: Loc: [/Users/qt/work/qt/qtbase/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp(6738)]
agent:2024/09/07 09:42:00 build.go:404: 571: QDEBUG : tst_QWidget::setLocale() qt.widgets.focus: Initializing focus chain of QWidget(0x16b9c9470)
agent:2024/09/07 09:42:00 build.go:404: 571: QDEBUG : tst_QWidget::setLocale() qt.widgets.focus: Initializing focus chain of QWidget(0x16b9c9440)
agent:2024/09/07 09:42:00 build.go:404: 571: QDEBUG : tst_QWidget::setLocale() qt.widgets.focus: Initializing focus chain of QWidget(0x16b9c9410)
agent:2024/09/07 09:42:00 build.go:404: 571: QDEBUG : tst_QWidget::setLocale() qt.widgets.focus: Initializing focus chain of QWidget(0x16b9c9410)
agent:2024/09/07 09:42:00 build.go:404: 571: QDEBUG : tst_QWidget::setLocale() qt.widgets.focus: QWidget(0x16b9c9410) removed from focus chain.
agent:2024/09/07 09:42:00 build.go:404: 571: QDEBUG : tst_QWidget::setLocale() qt.widgets.focus: Initializing focus chain of QWidget(0x16b9c9440)
...

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