[MERGE] Move ignores updating functionality out of cmd_ignore

[John Arbash Meinel]

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Jelmer Vernooij wrote:
| The attached patch moves the code that adds ignores to the ignore file
out of
| the cmd_ignore class into a separate function in bzrlib.ignore. This
| should make it easier for other users of bzrlib to update the ignores
| file.
|
| Cheers,
|
| Jelmer
|
|

I actually think this should be a method on MutableTree, so that
specific tree implementations can customize how they handle ignores.

I suppose that isn't critical, and can be brought in once we have
multiple trees that act differently, but it would be nice to have.

Otherwise, I'm very happy to see this moved out of cmd_ignore. I thought
there might be another location that was trying to do something similar,
though. You might want to search around for '.bzrignore'.

John
=:->

BB:tweak

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