[ChangeLog][QtWidgets][QDockWidget] A floating dockwidget that doesn't have the DockWidgetClosable feature flag set can no longer be closed by a call to QWidget::close or a corresponding keyboard shortcut (such as Alt+F4). Fixes: QTBUG-116752 Pick-to: 6.5 Change-Id: I7859a2eed11f0e4ee013f7f56611e282e9bcae9a Reviewed-by: Santhosh Kumar <santhosh.kumar.selvaraj@qt.io> Reviewed-by: Doris Verria <doris.verria@qt.io> Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io> (cherry picked from commit 6c90aa029bb65dc5357ac7a26738e711c97732a2) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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