Tor Arne Vestbø d599451e24 Guard QWindowsContext::instance() during screen change on shutdown
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>
2023-10-09 17:18:21 +00:00
2020-11-16 10:02:08 +02:00
2023-10-02 21:11:18 +00:00
2015-08-18 19:59:14 +00:00
2023-09-14 10:27:23 +03:00
2012-09-07 15:39:31 +02:00
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