[Interest] Return null QSGNode from updatePaintNode to erase previously drawn things

[Данил Патрушев]

Hi all. I have a quick item which does some custom drawing and has a few
visible child items. At some point I want to erase all the stuff drawn by
this item, which I thought I could by returning a null qsgnode from
updatePaintNode, but the stuff remains visible. I have a few ideas how to
work around this, but I just wonder if this is considered normal behavior.
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