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Fix crash when setting override cursor on multiple clients

Andreas Sturmlechner requested to merge asturmlechner/qtbase:asturmlechner/QTBUG-116671-vnc-override-cursor-crash into kde/5.15

When a client disconnects, we need to disable its client cursor, otherwise there will be a dangling pointer stored in the pointer.

In addition, we should reinstate the default cursor only when all clients have disconnected.

Note: Patch provided in bug report.

[ChangeLog][vnc] Fixed a crash when setting an override cursor on multiple clients.

Pick-to: 5.15 6.2 6.4 Fixes: QTBUG-105057 Change-Id: I0399087a924c05c8d0811b0ec0305b7857da5d3c Reviewed-by: Volker Hilsheimer volker.hilsheimer@qt.io (cherry picked from commit 9b6e79ab)

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