(viz) should we allow floating rulers ?
The following discussion from !1062 (merged) should be addressed:
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@aancel1 started a discussion: It is quite strange as currently, we can draw rulers that can go out of the scope of the volume.
I would suggest to add a check in the button_release_event function to ensure that the second point is indeed either on an entity (negato) or on a ManualObject (sphere).
Otherwise it might be a good idea to discard the ruler as in this last case, it means that it would be created in an empty space ?