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

Basic info

• Commit SHA: f05c5d80
• Platform: all

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