compose-multiplatform: System trays/menus do not work on Ubuntu 18.04 w/ Gnome 3.28.2

Expected Tutorials would work out of the box

Actual

When running the Tray_Notifications_MenuBar tutorials on Ubuntu 18.04, the applications launch but do not function as expected.

There is the standard icon (with an exit option), but none of the application-specified menus. The notifier similarly does not present.

In the same manner, the Windows Attributes tutorial fails, as there are no menu options to click.

When I run this, it confirms that the SystemTray is no longer supported.

        if (!SystemTray.isSupported()) {
            System.out.println("SystemTray is not supported");
        }

I tried TopIconsPlus Gnome shell extension ( as per the Gnome Release notes ) and got the Tray example to work, but not the others. TBH, UI was not great either.

I also tried AppIndicator Gnome shell extension (as per the documentation on https://github.com/dorkbox/SystemTray ). That didn’t work for any of the tutorials.

Suggestions

• Ideal would be for the Menus, Trays, Notifiers, etc to work out of the box cross-platform. This one is especially the ideal if you are distributing your app.
• Secondary would be if we checked SystemTray.isSupported() under the hood and directed the user/dev to a wiki on how to fix it. I have not yet managed to fix it myself, so do not have a suggestion on what that option would look like.