function goNextPrevDoc(inc) {
        var file = DocumentManager.getNextPrevFile(inc);
        if (file) {
            DocumentManager.beginDocumentNavigation();
            CommandManager.execute(Commands.FILE_OPEN, { fullPath: file.fullPath });
            
            // Listen for ending of Ctrl+Tab sequence
            if (!_addedNavKeyHandler) {
                _addedNavKeyHandler = true;
                $(window.document.body).keyup(detectDocumentNavEnd);
            }
        }
    }
Navigate to the next/previous (MRU) document. Don't update MRU order yet