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Implement "context lost" functionality
Miikka Heikkinen authored
Moving Canvas3D between windows requires support for this.

Change-Id: I1a3bbd120d9915bf8a6cc90ec30c1909df58d225
Task-number: QTBUG-48711
Reviewed-by: default avatarPasi Keränen <pasi.keranen@digia.com>
e05b1306