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Convert callers of Branch.revision_history() to Branch.last_revision_info() where sensible.
(Wouter van Heyst, Robert Collins)

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Lines of Context:
bzrlib/info.py
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    branch = working.branch
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    basis = working.basis_tree()
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    work_inv = working.inventory
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    history = branch.revision_history()
 
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    branch_revno, branch_last_revision = branch.last_revision_info()
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    try:
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        tree_last_id = working.get_parent_ids()[0]
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    except IndexError:
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        tree_last_id = None
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    if len(history) and tree_last_id != history[-1]:
 
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    if branch_revno and tree_last_id != branch_last_revision:
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        tree_last_revno = branch.revision_id_to_revno(tree_last_id)
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        missing_count = len(history) - tree_last_revno
 
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        missing_count = branch_revno - tree_last_revno
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        print
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        print 'Working tree is out of date: missing %d revision%s.' % (
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            missing_count, plural(missing_count))