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Methods
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__init__
_finish
_merge
_redo
_undo
finish
merge
redo
undo
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__init__
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__init__ ( self )
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_finish
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_finish ( self )
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_merge
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_merge ( self, delta )
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_redo
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_redo ( self )
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_undo
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_undo ( self )
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finish
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finish ( self )
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Exceptions
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UndoError( "Delta is already checkpointed", self )
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merge
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merge ( self, delta )
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Exceptions
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UndoError( "Delta no longer active", self )
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redo
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redo ( self )
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undo
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undo ( self )
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Exceptions
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UndoError( "Can't undo", self )
UndoError( "Repeated undo", self )
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