[MERGE] Fix #175520 by implementing a --deep option for log

[John Arbash Meinel]

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...
> Initially we could support just --current and --last. We'll need
> multiple id support in the core of log before --once is added,
> assuming we agree that the right behaviour is to union-log
> against the set of file-ids that once represented a file of that
> name.

I'm not sure about --once as a name, it took me a while to figure out
why you thought of it. The functionality seems ok

> 
> While I'm at it, here are some thoughts on "log DIR". By default,
> we should just log what happened to the directory object. To see
> what happened to each of the current children, "log --children DIR".
> (Again, that will need multiple id support.) To see what happened
> to files that were once in DIR, "log --children --once DIR" say.
> 
> Ian C.
> 
> 

I think most people would expect "bzr log DIR" to show the --children
form by default. I think while our current behavior is technically an
alternative, it is pretty useless.

John
=:->
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