Look into Qt Quick autotests ('scenegraph' autotest was ported, needs retesting). What else needs to be done?
During the QRhi port for Qt 5.14 a small number of scenegraph-related autotests got updated to be able to function with the QRhi-based rendering path as well. However, for 6.0 we need to go through everything under tests/auto and see if something needs updating or removing. This exercise is similar what was described for examples/quick/scenegraph in