[PATCH] shelve: always backup shelves instead of deleting them

[Matt Mackall]

> What if we only kept the backup shelves around for a limited time?  Like,
> every time we do a shelve/unshelve we delete any shelve-backups older than
> a month.  That provides the recoverability behavior, without the permanent
> growth.

I think a last-N strategy is a better fit.

-- 
Mathematics is the supreme nostalgia of our time.