Mailbox loading should be interruptable

[aaronl@…]

It would be nice if mutt allowed a key to be bound to a function which aborted loading of a mailbox and left mutt in the (no mailbox open) state. Often when I skim mailboxes I make an off-by-one error and open some huge mailbox instead of the one I wanted. Waiting a few seconds is not intolerable, but having a key to abort the loading and get on with what I was trying to do would be a great feature.

I'm not sure which context this binding should go under.

[brendan]

Refiled as change-request.