Mouse position-to-clipboard UI

[Dima K. <gn...@di...>]

Hi.

Currently you can use the '1' and '2' keys to change the format of the
status line in the interactive terminals. You can separately use '3' and
'4' to change the format of the string that gets copied to the clipboard
on a double-click.

This is somewhat confusing, expecially because there's no user feedback
at ALL to the '3' and '4' keys. At its most basic, it'd be good to know
which clipboard format we just switched to. I propose something even
simpler, however: how would we all feel about getting rid of '3' and '4'
entirely, and to let the clipboard format to be the same as the status
line format? Then the user feedback is clear, and we have less invisible
state?

dima