What's this tmux copy/paste interop for?

[jbranchaud]

I've been digging through the .tmux.conf file recently. There are a couple lines designated as copy/paste interop:

# Copy/paste interop
bind C-c run "tmux show-buffer | reattach-to-user-namespace pbcopy"
bind C-v run "reattach-to-user-namespace pbpaste | tmux load-buffer - && tmux paste-buffer"

A couple things about this:

1. This is apparently binding Ctrl-c to run a command to copy to the Mac OSX system buffer. That's in conflict with the system's use of Ctrl-c, which is to send a SIGINT to the current application. Is this intended? Or should it instead use the meta key (i.e. Cmd) -- M-c? Update: I was forgetting that the <prefix> comes first, so this would be triggered with Ctrl-z Ctrl-c.
2. Versions of tmux 2.6+ shouldn't need to do the reattach-to-user-namespace thing anymore (source). I think that wrapper can be removed. Is there a need to support versions of tmux older than 2.6? If there is, we can add if-shell checks to only do the reattach for older versions so that reattach-to-user-namespace is not a dependency.
3. I tried commenting out these lines altogether to see what functionality they might be account for. I then held option while making a mouse selection, hit Cmd-c, then hit Cmd-v. It copy-pasted my selection as expected. So, are these lines even needed or is this just a vestige of terminals of yore? Update: Same mistake as above with the missing <prefix>.