QXcbVirtualDesktop::m_workArea is not updated after screen rotation if _NET_WORKAREA is not updated, e.g. when a window manager is not running. Use width of -1 for m_workArea to indicate that _NET_WORKAREA is not set and thus there is no need to find its intersection with screens' geometries. Change-Id: Ic1f3ec23576ed8407a76cc2b9f84a145c67b1d4b Reviewed-by: Liang Qi <liang.qi@qt.io> (cherry picked from commit df28d75721f7e57f4421ed8c4b8131da742f3967) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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