function _revertSelection(previousPath, switchToWorkingSet) {
        model.setSelected(previousPath);
        if (switchToWorkingSet) {
            FileViewController.setFileViewFocus(FileViewController.WORKING_SET_VIEW);
        }
    }
@private

Reverts to the previous selection (useful if there's an error).

@param {string|File} previousPath The previously selected path.
@param {boolean} switchToWorkingSet True if we need to switch focus to the Working Set