[Interest] Glueing widgets together

[Sensei]

Dear all,

I've posted some time ago a question about moving widgets simultaneously.
However, the proposed solutions were unsatisfactory.

That is probably because I've expressed my needs in a non useful way. So
here it goes.

I need to "glue together" two widgets, so that when one moves, the other
*simultaneously* moves.

They should appear glued even when dragging around, fast and slow. Like if
the "follower" is simply painted over the moving widget.

The proposed solutions involve getting the mouse move events dealt with.
This resulted in a visible delay, and that isn't what I want: I don't want
to see the window moving with the follower staying still, and after few
instants, the follower (disappearing from where it was) painted in the
right position.

Is there any way I can achieve this visual effect?

Thanks & Cheers!
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