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merge up with HEAD and with test-fixes

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bzrlib/diff.py
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def show_diff(b, revision, specific_files, external_diff_options=None,
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              revision2=None):
 
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              revision2=None, output=None):
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    """Shortcut for showing the diff to the working tree.
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    b
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    The more general form is show_diff_trees(), where the caller
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    supplies any two trees.
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    """
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    import sys
 
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    if output is None:
 
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        import sys
 
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        output = sys.stdout
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    if revision == None:
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        old_tree = b.basis_tree()
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    else:
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        new_tree = b.revision_tree(b.lookup_revision(revision2))
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    show_diff_trees(old_tree, new_tree, sys.stdout, specific_files,
 
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    show_diff_trees(old_tree, new_tree, output, specific_files,
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                    external_diff_options)
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