             options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: attributes)
         // log.debug("\(commentRect.size.width),\(commentRect.size.height)")
         
-        return commentRect.size.height
+        return max(commentRect.size.height, self.rowDefaultHeight)
     }
     
     func tableViewColumnDidResize(aNotification: NSNotification) {


    // row-height cache
    var rowHeightCacher = [Int: CGFloat]()
    var lastShouldScrollToBottom = true
    var currentScrollAnimationCount = 0
    

    
    func setupTableView() {
        self.tableView.doubleAction = "openUserWindow:"
        self.rowDefaultHeight = self.tableView.rowHeight
    }
    
    func registerNibs() {
