javafx-embed-swing/src/javafx/embed/swing/JFXPanel.java

*** 658,668 ****
  
      private final AWTEventListener ungrabListener = new AWTEventListener() {
          @Override
          public void eventDispatched(AWTEvent event) {
              if (event instanceof sun.awt.UngrabEvent) {
!                 Platform.runLater(new Runnable() {
                      @Override
                      public void run() {
                          if (JFXPanel.this.stagePeer != null) {
                              JFXPanel.this.stagePeer.focusUngrab();
                          }
--- 658,668 ----
  
      private final AWTEventListener ungrabListener = new AWTEventListener() {
          @Override
          public void eventDispatched(AWTEvent event) {
              if (event instanceof sun.awt.UngrabEvent) {
!                 SwingFXUtils.runOnFxThread(new Runnable() {
                      @Override
                      public void run() {
                          if (JFXPanel.this.stagePeer != null) {
                              JFXPanel.this.stagePeer.focusUngrab();
                          }
*** 691,701 ****
              }
          });
  
          updateComponentSize(); // see RT-23603
  
!         Platform.runLater(new Runnable() {
              @Override
              public void run() {
                  if ((stage != null) && !stage.isShowing()) {
                      stage.show();
                      firstPanelShown = true;
--- 691,701 ----
              }
          });
  
          updateComponentSize(); // see RT-23603
  
!         SwingFXUtils.runOnFxThread(new Runnable() {
              @Override
              public void run() {
                  if ((stage != null) && !stage.isShowing()) {
                      stage.show();
                      firstPanelShown = true;
*** 709,719 ****
       * Notifies this component that it no longer has a parent component.
       * When this method is invoked, any KeyboardActions set up in the the
       * chain of parent components are removed.
       */
      @Override public void removeNotify() {
!         Platform.runLater(new Runnable() {
              @Override
              public void run() {
                  if ((stage != null) && stage.isShowing()) {
                      stage.hide();
                  }
--- 709,719 ----
       * Notifies this component that it no longer has a parent component.
       * When this method is invoked, any KeyboardActions set up in the the
       * chain of parent components are removed.
       */
      @Override public void removeNotify() {
!         SwingFXUtils.runOnFxThread(new Runnable() {
              @Override
              public void run() {
                  if ((stage != null) && stage.isShowing()) {
                      stage.hide();
                  }