Do not show the camera tooltip if the window is not focused.

Fixes #1597

Author: leMaik

chunky/src/java/se/llbit/chunky/ui/RenderCanvasFx.java

@@ -440,6 +440,10 @@ public void setRenderListener(RenderStatusListener renderListener) {
 
   @Override public void sceneStatus(String status) {
     Platform.runLater(() -> {
+      if (!getScene().getWindow().isFocused()) {
+        return;
+      }
+
       Point2D offset = localToScene(0, 0);
       tooltip.setText(status);
       tooltip.show(this,