Using the latest HTMLUnit version 4.0.0 opening the JavaScript visual debugger via [org.htmlunit.util.WebClientUtils.attachVisualDebugger(WebClient](https://www.htmlunit.org/apidocs/org/htmlunit/util/WebClientUtils.html#attachVisualDebugger-org.htmlunit.WebClient-) causes a deadlock.
The Swing window of the visual debugger is visible but doesn't allow user input.
As you can see from the following screenshot the EDT is waiting to get hold on the HtmlPage which is held by a thread that seems to be loading JavaScript and has hit a "breakpoint"? Unfortunately there is no way of continuing since the EDT is blocked and therefore no user input is possible:
For the records: the HTMLUnit 4.0.0 is used in an environment with Selenium 4.19.1 and the HTMLUnit driver htmlunit3-driver-4.19.1.jar
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