Force redraw on updateSize

Related to losing axes/scale in sequence of toImage

Author: dy

src/plots/gl2d/scene2d.js

@@ -233,6 +233,9 @@ proto.updateSize = function(canvas) {
         canvas.height = pixelHeight;
     }
 
+    // make sure plots rendered right thing
+    if (this.redraw) this.redraw()
+
     return canvas;
 };