[vtkDistanceWidget] 2D point handle does not follow mouse interaction
In use of a 2D widget such as vtkDistanceWidget + vtkDistanceRepresentation2D, the point handles are fixed on the display position even when the view is zoomed, spun, or etc. after the handles are moved by mouse interaction. Meanwhile, axis actor follows such mouse operations.
The reason is the world position of the point handle is not updated in vtkPointHandleRepresentation2D::Translate. But, distance widget uses world position to draw the axis actor (c.f. ctor of vtkDistanceRepresentation2D).