[]startDrag 被拖拽物体所在view发生旋转后的bug

方法：重写核心库文件，
laya.utils.Dragging 下的
/**
        *拖拽的循环处理函数。
        */
        __proto.loop=function(){
            var point=this._parent.getMousePoint();
            var mouseX=point.x;
            var mouseY=point.y;
            var offsetX=mouseX-this._lastX;
            var offsetY=mouseY-this._lastY;
            if(/macintosh|window/.test(navigator.userAgent.toLowerCase()))
            {
                console.log("mouseX:=["+ mouseX+"] mouseY:=["+mouseY+"] _lastX:=["+this._lastX+"] _lastY:=["+this._lastY+"] offsetX:=["+offsetX+"] offsetY:=["+offsetY+"]");
            }
            else
            {
                offsetX = this._lastY - mouseY;
                offsetY = mouseX-this._lastX;
            }

这个demo可以发来吗