* unfortunately the issue did still persist
* reason still unknown
* not expanding all seems to solve it
Maybe using the high level API without own model would be better
https://www.bogotobogo.com/Qt/Qt5_QTreeWidget.php
* after updating the container update "expandAll" was called
* in onExpanded multiple "fullResizeToContents" occured, resulting in the healp issue below
* as it was a good idea anyway to reduce the slow "fullResizeToContents" anyway, so we are using a CDigestSignal
* this also solved the HEAP issue (for some reason I have NOT investigated)
HEAP[swiftdata.exe]: HEAP: Free Heap block 000001AB439BFFF0 modified at 000001AB439C00BC after it was freed