QGraphicsSceneFindItemBspTreeVisitor::visit crashes due to an obsolete PaintEvent after QGraphicsScene::removeItem

[cSielaff]

Replying here, even though this thread is quite old ... I also ran into the same issue using PySide2. Disabling BSP indexing does indeed work for me, but is a sub-optimal solution because the scene that I'm working with can get arbitrarily large. I also tried to call update prepareGeometryChange before removing the item, and while that did seem to work for a while, the error re-appeared just a few weeks later.

What worked for me (so far) is manually removing all child items before removing the item itself...
To that end, I am overwriting the QGraphicsScene::removeItem method in Python:

class GraphicsScene(QtWidgets.QGraphicsScene):
    def removeItem(self, item: QtWidgets.QGraphicsItem) -> None:
        for child_item in item.childItems():
            super().removeItem(child_item)
        super().removeItem(item)

Note that this will not quite work the same in C++ because QGraphicsScene::removeItem is not a virtual method, so you will probably have to add your own method removeItemSafely or whatever.

Disclaimer: Other methods have worked for me as well ... until they didn't. I have not seen a crash in QGraphicsSceneFindItemBspTreeVisitor::visit since introducing this workaround, but that does not mean that this is actually the solution. Use at your own risk.