Is it possible to make a modal PopupPanel block contextmenu events on other windows?

I just noticed that a modal PopupPanel blocks click and mousedown events, but it allows the user to trigger contextmenu events against other windows:

https://screencast.com/t/bRM09iCeF

This might be working as designed, depending on how you interpret the documentation:

http://www.gwtproject.org/javadoc/latest/com/google/gwt/user/client/ui/PopupPanel.html#setModal-boolean-

When the popup is modal, keyboard or mouse events that do not target the PopupPanel or its children will be ignored.

When I subclass onPreviewNativeEvent and log the events that it sees, the contextmenu event isn't being reported; maybe it's not considered to be a mouse event?

Is there any way for me to optionally include contextmenu in the set of events that get filtered through onPreviewNativeEvent?

The sample is a hacked version of the standard GWT Sample project:

package com.basis.sample.client;

import com.google.gwt.core.client.EntryPoint;

import com.google.gwt.dom.client.NativeEvent;

import com.google.gwt.event.dom.client.ClickEvent;

import com.google.gwt.event.dom.client.ClickHandler;

import com.google.gwt.event.dom.client.ContextMenuEvent;

import com.google.gwt.event.dom.client.ContextMenuHandler;

import com.google.gwt.event.dom.client.MouseDownEvent;

import com.google.gwt.event.dom.client.MouseDownHandler;

import com.google.gwt.user.client.Window;

import com.google.gwt.user.client.ui.Button;

import com.google.gwt.user.client.ui.DialogBox;

import com.google.gwt.user.client.ui.RootPanel;

public class Sample implements EntryPoint

{

    @Override

    public void onModuleLoad()

    {

        final Button popupButton = new Button("Popup");

        final Button sampleButton = new Button("Button");

        RootPanel.get("nameFieldContainer").add(popupButton);

        RootPanel.get("sendButtonContainer").add(sampleButton);

        class MyHandler

            implements ClickHandler, MouseDownHandler, ContextMenuHandler

        {

            @Override

            public void onClick(ClickEvent event)

            {

                Window.alert("onClick " + event);

            }

            @Override

            public void onContextMenu(ContextMenuEvent event)

            {

                event.preventDefault();

                Window.alert("onContextMenu " + event);

            }

            @Override

            public void onMouseDown(MouseDownEvent event)

            {

                if (event.getNativeButton() == NativeEvent.BUTTON_RIGHT)

                    Window.alert("onMouseDown (right) " + event);

            }

        }

        DialogBox popup = new DialogBox(false, true);

        popup.setText("Modal Dialog");

        Button closePopup = new Button("Close");

        closePopup.addClickHandler(new ClickHandler()

        {

            @Override

            public void onClick(ClickEvent event)

            {

                popup.hide();

            }

        });

        popup.add(closePopup);

        popupButton.addClickHandler(new ClickHandler()

        {

            @Override

            public void onClick(ClickEvent event)

            {

                popup.center();

            }

        });

        MyHandler handler = new MyHandler();

        popupButton.addDomHandler(handler, ContextMenuEvent.getType());

        sampleButton.addClickHandler(handler);

        sampleButton.addMouseDownHandler(handler);

        sampleButton.addDomHandler(handler, ContextMenuEvent.getType());

    }

}

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