Steps to reproduce:
- Load an image
- Select measurement view
- Draw circle
- select "Draw Angle" tool
--> first Error: a node in the datamanager is already created.
- Hover the mouse-cursor over a point of the circle
--> second Error: the measurement tool buttons are active again.
- Select the circle tool and try to draw a circle
--> it will turn out as an angle but only the first point can be set. No further interactions are possible.