8231864: JavaFX Labels in Tab's VBox is not displayed until it is cli…

…cked

Reviewed-by: arapte

modules/javafx.graphics/src/main/java/com/sun/javafx/sg/prism/NGNode.java

@@ -330,12 +330,14 @@ public void setTransformedBounds(BaseBounds bounds, boolean byTransformChangeOnl
         // cache needs to be regenerated. So we will not invalidate it here.
         if (dirtyBounds.isEmpty()) {
             dirtyBounds = dirtyBounds.deriveWithNewBounds(transformedBounds);
-            dirtyBounds = dirtyBounds.deriveWithUnion(bounds);
         } else {
-            // TODO I think this is vestigial from Scenario and will never
-            // actually occur in real life... (RT-23956)
+            // Non-empty dirty bounds mean that renderer did not consume them yet
+            // (ex. because the Node was not yet visible). We need to unionize dirty
+            // bounds with transformed bounds in case transformed bounds had changed
+            // and then proceed with updating dirty bounds to their new value.
             dirtyBounds = dirtyBounds.deriveWithUnion(transformedBounds);
         }
+        dirtyBounds = dirtyBounds.deriveWithUnion(bounds);
         transformedBounds = transformedBounds.deriveWithNewBounds(bounds);
         if (hasVisuals() && !byTransformChangeOnly) {
             markDirty();