mxGraphView.prototype.validateBackgroundPage=function(){if(this.graph.pageVisible){var a=this.getBackgroundPageBounds();null==this.backgroundPageShape?(this.backgroundPageShape=this.createBackgroundPageShape(a),this.backgroundPageShape.scale=this.scale,this.backgroundPageShape.isShadow=!0,this.backgroundPageShape.dialect=this.graph.dialect,this.backgroundPageShape.init(this.backgroundPane),this.backgroundPageShape.redraw(),this.graph.nativeDblClickEnabled&&mxEvent.addListener(this.backgroundPageShape.node,