Add the specified listener to the list of operation history listeners that are notified about changes in the history or operations that are executed, undone, or redone.
@param listener the IOperationHistoryListener to be added as a listener. Must not benull
. If an attempt is made to register an instance which is already registered with this instance, this method has no effect.
@see org.eclipse.core.commands.operations.IOperationHistoryListener
@see org.eclipse.core.commands.operations.OperationHistoryEvent
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