[Development] Behavior of mapToGlobal function when application is not the one active.

[NIkolai Marchenko]

A little bit of context: I am trying to organize getting interface
positions/sizes out of an application via RPC interface. To do this I have
inserted grpc server code into a GUI app and grpc client into another,
testing application.

Essentially, when the client app sends a signal, the main app should do
button->mapToGlobal(QPoint(0,0,)) and return this via RPC.

What happens in fact, is that unless I specifically press the "get
coordinates" button on the main app, the coordinates I get are completely
wrong.

Scenario 1: mapToGlobal at the button press of the same app: correct
coordinates
Scenario 2: mapToGlobal at rpc signal from client app: completely wrong
coordinates AND size,  coordinates for buttons in the same layour are the
same.

What can this be?
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