anchor.diff:      this.gestureDetectorBehavior,
       this.tightMode,
       this.filterQuality,
  +    this.disableGestures,
     })  : imageProvider = null,
           assert(child != null);
   
  
positive.code: 
    /// Mirror to [PhotoView.tightMode]
    final bool tightMode;
  
    /// Quality levels for image filters.
    final FilterQuality filterQuality;
  
negative.code:             tightMode: pageOption.tightMode,
              filterQuality: pageOption.filterQuality,
              basePosition: pageOption.basePosition,
              disableGestures: pageOption.disableGestures,
            )
          : PhotoView(
              key: ObjectKey(index),
  