Instead of inventing another way to do this (and inevitably forgetting a
path where this should be re-enabled) I renamed the DcShortcup related
function and made them enable/disable the copy and paste shortcuts as
well.
Of course there now is one exception (isn't there always?): in "ADD" state
we don't want to be able to switch DCs, but we do want to be able to
paste.
Fixes#825
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
d34965135a