sap.ui.core.routing.HistoryDirection.Backwards
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The page has already been navigated to and it was the predecessor of the previous page.
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sap.ui.core.routing.HistoryDirection.Forwards
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The page has already been navigated to and it was the successor of the previous page.
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sap.ui.core.routing.HistoryDirection.NewEntry
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A new entry is added to the history.
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sap.ui.core.routing.HistoryDirection.Unknown
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A navigation took place, but it could be any of the other three states.
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