[Interest] Opening Qt/Qml window inside host app

[Tim Blechmann]

> In general, for VST2 your implementation of AEffEditor::open() should
> create the thread creating the application object and invoking
> exec(). That is the latest point you can use before it has to be
> created.

out of curiosity: doesn't QApplication::exec have to be created from the
main thread? in my experience, it is better to call sendPostedEvents()
from the main thread.

tim