Thread synchronization is blocket until window is moved or resized. This only happens under windows-gdi. On linux-x11 it works fine.
Run test project and try to move or resize the window.
That is a developer incorrectly using TThread, painting outside the OnPaint event - undefined and unsupported behaviour from just about any GUI toolkit. Thus a developer issue, not a fpGUI one. I use fpGUI multi-threaded apps all the time, and have no such issue.
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