Proposal: backup hook, trash, and multiple undo

[Bill Barry]

Matt Mackall wrote:
> merge can mangle files that get merged, which is sometimes just as
> good as deleting them. We currently store a .orig file (which clobbers
> any existing .orig file), this would also hand off that file to the
> backup hook.
>
> (Typical trash cans also clobber identical files.)
>   

So this change could potentially mean no more .orig files? Awesome!!!