javafx.scene.layout.TilePane.layoutChildren prints debug output in non-debug mode

   782 @Override protected void layoutChildren() {
   783 StackTraceElement[] stack = Thread.currentThread().getStackTrace();
   784 for (int s = 0, max = Math.min(5,stack.length); s < max; s++) System.err.println(stack[s]);


These debug messages could affect performance results.

I guess this needs to be either removed or enabled only in debug mode.