[Solved] Fedora 23 + Gnome + Hexchat, window opening issue
For some reason this appears to have cured itself. I'm not sure what I did, it might be because I juggled tabs around in Vivaldi, it might be something else, but the problem has gone away. Weird! Information is here if anyone cares to try and repeat it. I will re-post if I can figure out a way to reliably repeat the behaviour. But for now, nothing to see here!