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Add a new method ``Tree.revision_tree`` which allows access to cached
trees for arbitrary revisions. This allows the in development dirstate
tree format to provide access to the callers to cached copies of 
inventory data which are cheaper to access than inventories from the
repository. (Robert Collins, Martin Pool)

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bzrlib/diff.py
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    :return: A Popen object.
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    """
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    if capture_errors:
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        preexec_fn = _set_lang_C
 
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        if sys.platform == 'win32':
 
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            # Win32 doesn't support preexec_fn, but that is
 
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            # okay, because it doesn't support LANG either.
 
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            preexec_fn = None
 
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        else:
 
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            preexec_fn = _set_lang_C
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        stderr = subprocess.PIPE
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    else:
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        preexec_fn = None