Restore Fitts' law for the panel
This is basically a revert of 21a1b654. The justificaiton is correct the mask needs to be in local coordinates this is/was achieved via mapFromGlobal. The problem was that at various points the obtained geometry was intersected with the screen geometry. Now that is is fixed we actually want to use screenPanelRect as the input region which includes the area around the floating panel. BUG:480016 FIXED-IN:6.0