[Linux] Crash to desktop in Browser using OpenWindowListener

[Phillipus]

On Linux with the latest SWT I-build run the following snippet and click the "Click" link. It should open the link in the Browser but after a few seconds quits to desktop. In an RCP app the whole app quits to desktop.

• Works on Windows and Mac
• Crashes on Linux Mint 22.3 (X11) and Ubuntu 26.04 (Wayland)
• Java 21
• Latest SWT I-build

import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class SWTBrowserTest {
    
    public static void main(String[] args) {
        final Display display = new Display();

        final Shell shell = new Shell(display);
        shell.setText("SWT Browser");
        shell.setLayout(new FillLayout());
        shell.setSize(400, 400);
        
        Browser browser = new Browser(shell, SWT.NONE);
        browser.setText("<a href='https://www.eclipse.org' target='_blank'>Click</a>");
        
        browser.addOpenWindowListener(event -> {
            event.browser = browser;
        });
        
        shell.open();

        while(!shell.isDisposed()) {
            if(!display.readAndDispatch()) {
                display.sleep();
            }
        }

        display.dispose();
    }
}

[iloveeclipse]

with the latest SWT I-build

Can you bisect to the build caused regression?

[Phillipus]

Went as far back as e4890da (May 28, 2025) and still crashed. So it's a problem for some time. Didn't go back further than that.

[akurtakov]

I fully understand that crashes should not happen that way and this needs to be fixed to at least give proper message for improper API usage which I believe this one is.
This snippet doesn't adhere to the OpenWindowListener contract (

eclipse.platform.swt/bundles/org.eclipse.swt/Eclipse SWT Browser/common/org/eclipse/swt/browser/OpenWindowListener.java

Line 51 in fba7f07

* <li>(out) {@link WindowEvent#browser}: the new (unique) <code>Browser</code> that will host the

) - it requires a new/unique Browser .
If you want it to open in new browser window smth like the following should work:

browser.addOpenWindowListener(event -> {
	Shell popupShell = new Shell(shell, SWT.SHELL_TRIM);
	popupShell.setLayout(new FillLayout());

	Browser popupBrowser = new Browser(popupShell, SWT.NONE);
	popupBrowser.addVisibilityWindowListener(VisibilityWindowListener.showAdapter(e -> {
		if (e.size != null) popupShell.setSize(e.size);
		popupShell.open();
	}));
	popupBrowser.addCloseWindowListener(e -> popupShell.close());

	event.browser = popupBrowser;
});

If you want it to open in the same browser, target='_self' does the job without any listener. (In the snippet backticks are used for _blank which will make webkitgtk ignore it.)

[Phillipus]

I was trying to make it so that if there is target='_blank' in a link in the HTML this would be ignored and instead open the link in the same Browser. This works on Windows and Mac but not Linux.

In the snippet backticks are used for _blank which will make webkitgtk ignore it.

Those should be apostrophes. I've edited the snippet.

[akurtakov]

browser.addProgressListener(ProgressListener.completedAdapter(e -> {
        	browser.execute("""
        		(() => {
        			document.querySelectorAll('a[target="_blank"]').forEach(a => a.target = '_self');
        		})()
        	""");
        })); 

@Phillipus Wouldn't smth like ^^^ do the trick for you ?

[Phillipus]

@Phillipus Wouldn't smth like ^^^ do the trick for you ?

Thanks, I'll test that.

[akurtakov]

@Phillipus so did the suggestion work for you?