prevent Window Moving?

[high_flyer]

What is an "informational" event?
I will not negate what you wrote, since it was long ago since I had to deal with move events.
I will test it, and reply again.
But I think you are wrong - or at least, that one should be able to configure if move events should get in before the mouse button is released if what you say is correct.

A work around could be done by ignoring mouseMoveEvents.

The docs says nothing about "only after mouse release":

If the widget is a window, the position is that of the widget on the desktop, including its frame.

When changing the position, the widget, if visible, receives a move event (moveEvent()) immediately. If the widget is not currently visible, it is guaranteed to receive an event before it is shown.

By default, this property contains a position that refers to the origin.