Destructing the QWindowsScreenManager might result in a WM_DISPLAYCHANGE, at which point our QWindowsContext instance is likely gone. We need to guard against that. Fixes: QTBUG-117473 Pick-to: 6.5 Change-Id: If32941c5c11231f7c27e9dde54f4315f18da1100 Reviewed-by: Wladimir Leuschner <wladimir.leuschner@qt.io> Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io> Reviewed-by: Timothée Keller <timothee.keller@qt.io> (cherry picked from commit 7d663d2e08fb71801f0f1f084a124e706722bf0f) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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