Since [0], transform gizmos are no longer hidden during transform.
The same can be observed for rotation gizmos.
However, as a workaround for these rotation gizmos, there was already a
drawing utility running.
With the gizmo and the utility this drawing is now being done twice.
So remove the utility/workaround and update the gizmo accordingly.
[0] {648350e456490f8d6258e7de9bf94d3a6a34dbb2}
Differential Revision: https://developer.blender.org/D9542