This field indicates which action the program should perform when a split line is moved to a guest
where another part of the split line exists already:
Never Combine - the two split parts are never combined.
Always Combine - the two split parts are always combined.
Combine on Confirmation - the program displays a confirmation window. On confirmation, the program combines the two split parts.
If more than one line is selected for the move, the confirmation applies to any split lines of the
selected lines so the user only has to answer once.