TSplitter resize causes draw artifacts

[MISV]

I think thee is an issue in how the controls receive resize/paint updates

While I am working on another problem I noticed that resizing complex UIs with TSplitter causes a lot of misdrawing where parts of drawing is left hanging (and some places the control ext placement is not recalculated)

I will try return with example and post to bug tracker if anyone including myself can create a demo...