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Revert "Fix for possible crash in QSGDefaultLayer::grab"

Andreas Sturmlechner requested to merge asturmlechner/qtdeclarative:QTBUG-94975-heap-use-after-free into kde/5.15

This reverts commit 1c5de027.

The fix here is not correct. Calling a QSGRhiLayer function from the gui thread is very wrong and can cause a set of unexpected issues. The Address Sanitizer catches this by recognizing that the render thread is trying to do something with an object destroyed in the meantime on the main thread in the layer->setItem(null) call.

The issue the original fix is trying to address needs to be addressed in some different form.

Fixes: QTBUG-94975 Pick-to: 6.2 6.1 5.15 Change-Id: I46f904026281201fc6d233ed7d3bdc7080934afe Reviewed-by: Christian Strømme christian.stromme@qt.io (cherry picked from commit a5f03616)

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