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Painting in VirtualStringTree gets stuck/frozen when scrolling

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I'm using VirtualTree 7.6.1, in Delphi Sydney (10.4) I do implement some custom painting in BeforeCellPaint, AfterCellPaint, AfterItemErase, AfterItemPaint and PaintText. However, the below problem occurs even when I remove all these custom paint event handlers.


As in below video, when scrolling with the scrollbar, painting is not smooth. It gets "stuck" and repeat paints a particular node text. When the scrollbar is released, the tree repaints correctly.


Has anyone experienced something like this? Any ideas of what could be causing the problem?



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How is your text output handled within the VST? It could be that you're doing tings in OnGetText which are a bit time consuming.

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