Checkbox show trajectory 'only for visible people' working incorrectly

In the tracking tab, there is an option to show trajectories of visible people only. The function of this checkbox is inverted.

If the checkbox is unchecked, only trajectories of people, that are recognized in this frame are shown. If it is checked, all trajectories are shown, even if the person is not on the screen.

This is the opposite of the expected behaviour.

Version: current master branch (4d1cce6f)