The Ctrl+C and the mouse select are 2 different buffers. Some applications do not accept the mouse select buffer though, and that's annoying.
In the best case you can CTRL+C some text, then go mouse select another, and paste both in a new place with CTRL-V and middle mouse button. Don't mix the order tho.


That's what a good co-op game does too you. Makes everything in life unbearable except playing with Roy.