HTML images trigger ThreadCheckingRepaintManager thread violation

[BullyWiiPlaza]

I use code to detect EDT thread violations (e.g. a non-EDT thread modifies the Swing GUI):

private static void setupThreadViolationsDetector()
{
	ThreadCheckingRepaintManager repaintManager = new ThreadCheckingRepaintManager(true);
	RepaintManager.setCurrentManager(repaintManager);
}

However, when I load an HTML code snippet which contains loading an image into the GUI, the following wrong thread exception is being printed, even though JTextPane.setText(myHTML) is called on the EDT.

----------Wrong Thread START
java.lang.Exception
	at com.jidesoft.utils.ThreadCheckingRepaintManager.checkThreadViolations(ThreadCheckingRepaintManager.java:78)
	at com.jidesoft.utils.ThreadCheckingRepaintManager.addDirtyRegion(ThreadCheckingRepaintManager.java:72)
	at java.desktop/javax.swing.JComponent.repaint(JComponent.java:4836)
	at java.desktop/javax.swing.text.html.ImageView.repaint(ImageView.java:655)
	at java.desktop/javax.swing.text.html.ImageView$ImageHandler.imageUpdate(ImageView.java:990)
	at java.desktop/sun.awt.image.ImageWatched$WeakLink.lambda$update$0(ImageWatched.java:144)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.desktop/sun.awt.image.ImageWatched$WeakLink.update(ImageWatched.java:142)
	at java.desktop/sun.awt.image.ImageWatched$WeakLink.newInfo(ImageWatched.java:159)
	at java.desktop/sun.awt.image.ImageWatched.newInfo(ImageWatched.java:197)
	at java.desktop/sun.awt.image.ImageRepresentation.imageComplete(ImageRepresentation.java:724)
	at java.desktop/sun.awt.image.ImageDecoder.imageComplete(ImageDecoder.java:153)
	at java.desktop/sun.awt.image.JPEGImageDecoder.produceImage(JPEGImageDecoder.java:143)
	at java.desktop/sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.java:269)
	at java.desktop/sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:212)
	at java.desktop/sun.awt.image.ImageFetcher.run(ImageFetcher.java:176)

----------Wrong Thread END

Is this a bug you could fix?

I'm using jdk-11.0.1 on Windows 10.

[jidesoft]

This piece of code was actually created by Scott Delap and Alex Potochkin. It is public domain. We included it for our user's convenience. We don't intent to take the maintenance responsibility. Feel free to modify it and send in a merge request.