Usually when selecting a track, the track selected before gets unselected. This is also true if you select tracks between the normal project window and the divided track list.
Also: when selecting events, the event selected before gets unselected. This does not work however, if you select an event of either the project window or the divided track list and then select one of the other area.
In that case both events keep being selected.
It gets further complicated when “track selection follows event selection” is active:
- Select an event of the project window ( in this case also the track gets selected)
- Select an event of the divided track list ( now also the track of the divided track list gets selected)
- Both events/tracks are now selected and continue to do so until you directly click on another track in either the project window AND click in an empty space in both areas
- if you now i.e. remove a track in the project window or divided track list, even the track in the other area gets removed, so if you don’t pay attention you accidently mess up both of your areas
PS: Similar things happen if you first select a track of one area and then an event of the other one. In that case both tracks and one event are selected.