tst_QGraphicsView::cursor2 fails a lot on Windows 10

Sometimes flaky, sometimes just failing.

https://testresults.qt.io/grafana/d/000000009/coin-single-test-details?orgId=1&var-project=qt%2Fqtbase&var-testcase=tests%2Fauto%2Fwidgets%2Fgraphicsview%2Fqgraphicsview&var-testfunction=cursor2&var-branch=5.13&var-branch=dev&var-inter=24h

It began around May 1 on 5.13 branch, apparently. It has been blocking a lot of integrations.

FAIL! : tst_QGraphicsView::cursor2() Compared values are not the same
Actual (view.viewport()->cursor().shape()): PointingHandCursor
Expected (Qt::IBeamCursor) : IBeamCursor
tst_qgraphicsview.cpp(2289) : failure location

https://testresults.qt.io/logs/qt/qtbase/d4106178388d9867013af595331f950f94230e9f/WindowsWindows_10x86_64WindowsWindows_10x86_64MSVC2015qtci-windows-10-x86_64-14-4b2495/9167158dd07ff8b67c01aef479412ed3855b09ac/test_1559857710/log.txt.gz