suspending patches without changing their identity

Hi,

One common complaint about rebase is that it changes the identity of a
patch even if you don't actually do something that requires it.

On an implementation level, I think it's hard to safely/accurately track 
whether or not something needs to have its identity changed. I'm also not 
sure about how the UI should work if it tried to track this - e.g. would 
the user be notified when a suspended patch needed to have its identity 
changed?

Anyway, I've come up with an alternative interim solution: a separate 
supercommand "stash" that maintains a separate suspended state where patch 
identity is always preserved. This is still highly experimental and even 
the "stash" name is just provisional.

If you'd like to play with it, see the wiki page:

http://darcs.net/Ideas/Stash

Cheers,

Ganesh