Gentlemen, (I sound like Prince's "Partyman" song)
I noticed all append-to-file says is
"Added to /var/neurdsbeurg.txt".
The problem is often the user thinks "good, thanks", when days later
he discovers few or no lines got added, that's right, even 0 bytes
will produce the same message. You see often we are not fully aware of
the extent of our regions, colored or not, especially when extending
off the screen.
Therefore I propose you change that message to say instead how many
line or bytes or characters or both or all three were copied over.