Combined orientation external target interpolation different within frame and on frame borders

Basic info

Bug description

If the enableExternalOrientation flag changes from false to true the behaviour on a frame border (where it uses Quaternions_prev_extOrientation as start point which is identity in this case) and within a frame where it uses the previous Quaternion of the external Orientation differ in case of external orienatation target interpolation.

Ways to reproduce

All self test conditions with external orientation

Edited by bayers