Pasting transactions in register

[Charles Day]

In a register, what is the expected behavior of the "Paste Transaction" menu
item when pasting to a non-new transaction? After asking for user
confirmation, should it paste the data into the existing transaction,
immediately commit the changes, and move down to the next transaction? Or
should it paste the data without committing and leave the user on the same
line? Or something else?
Cheers,
Charles