Improve usability of selection and jumping to frame after trajecorty changes in test tab
Created to resolve the following comment on MR:
Small usability thing, which I think does not need to be fixed here:
When I delete a trajectory, I get to the following line and jump to person e.g. 31, before the person 31 turns into person 30. That means I need to deselect and select the line with person 31 again to jump to the correct person.