Method _historyTableUndo

src/AutoNumeric.js:1761–1763

* 'Undo' the last user entry by going back one entry in the history table. * This keeps the following entries in order to allow for a 'redo'. * This does not modify the history table, only the pointer to the current state. * @private

()

     * @private
     */
    _historyTableUndo() {
        this._historyTableUndoOrRedo(true);
    }

    /**
     * 'Redo' the next user entry in the history table.