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Tooltips misplaced and hidden instantly for nested events
https://bryntum.com/products/scheduler/examples/nestedevents/
https://github.com/user-attachments/assets/7f564f52-df33-4d1e-a737-64b2b3b5ff42
This is the suggested fix.
The issue is when determining ancestor clipping elements to check the clipped, visible rectangle, it must go up the offsetParent axis, not parent
The second parameter truthy means go up the offsetParent axis is appropriate. A function is needed because of possible use of <svg> elements.