Expected: Deleting a line in the line management window removes the line from the list. User can select another line without changing the vehicle type filter automatically.
What actually happens: The deleted line is removed from the list. After that, selecting another line from the list causes the list to switch the vehicle type filter to the type of the selected line.
Could not reproduce, sorry.
EDIT: It seems to affect only the all tab. Should not occur anymore in r8179. Another old bug.