function _swapWorkingSetListIndexes(paneId, index1, index2) {
        var pane = _getPane(paneId);

        pane.swapViewListIndexes(index1, index2);
        exports.trigger("workingSetSort", pane.id);
        exports.trigger("_workingSetDisableAutoSort", pane.id);
    }
Mutually exchanges the files at the indexes passed by parameters.
@param {!string} paneId - id of the pane to swap indices or ACTIVE_PANE
@param {!number} index1 - the index on the left
@param {!number} index2 - the index on the rigth
@private