Painting in VirtualStringTree gets stuck/frozen when scrolling

[RaelB 4]

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?

 

Thanks

[TurboMagic 102]

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.