         else {
             self.contentDocumentView.prepareRect(_preperationRect, force: false)
         }
-        
     }
     
     @available(*, unavailable, renamed: "reloadLayout(_:scrollPosition:completion:)")

    }
    
    open override func layout() {
        
        
//        if #available(OSX 10.12, *) {
//            // Do nothing

    /*-------------------------------------------------------------------------------*/
    private var _resizeStartBounds : CGRect = CGRect.zero
    open override func viewWillStartLiveResize() {
        self.verticalScroller?.isHidden = true
        _resizeStartBounds = self.contentVisibleRect
        if self.collectionViewLayout.scrollDirection == .vertical {
            let ignore = self.leadingView?.bounds.size.height ?? self.contentInsets.top
