[Interest] Logging meta call events

[Bernhard]

> > This would not allow me to integrate the findings into my custom state
> > engine log (which also contains transitions and a lot more things in
> > chronological order).
> 
> The hook itself would. See qsignalspy.cpp for how to install it.
> 
> Your callbacks need to be thread-safe.

So you are not talking about the public, documented QSignalsSpy API, right?
Is that hook what QSignalSpy uses internally?

I will look into this tomorrow. For the moment I could not find a
qsignalspy.cpp in the Qt sources. 

Thank you!

-- 
Kind Regards
Bernhard Lindner