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Please run the snippet from bug 509503 with the latest SWT 4.8 master commit. If launched with SWT_GTK3=0, it can be closed with right-clicking a table item, but not if launched with SWT_GTK3=1.
Wayland or X11? AFAIK there is an issue with mouse listeners on Wayland, so that could be causing this.
I'm using Fedora 27 - don't know whether it uses Wayland or X11.
(In reply to Thomas Singer from comment #2) > I'm using Fedora 27 - don't know whether it uses Wayland or X11. It uses Wayland by default, unless you specified "GNOME on Xorg" at the login screen, or you are running the snippet with the GDK_BACKEND=x11 environment variable set. I've tried the snippet for this bug and I cannot reproduce the issue on X11 (on Fedora 27). It does happen with Wayland though, so I am marking this as a duplicate of bug 529126. *** This bug has been marked as a duplicate of bug 529126 ***