Slack is setting NET_WM_WINDOW_TYPE = NET_WM_WINDOW_TYPE_MAIN. This value is not defined in the EWMH spec and has zero results on Google.
A temporary work around is to run `xprop -f _NET_WM_WINDOW_TYPE 32a -set _NET_WM_WINDOW_TYPE _NET_WM_WINDOW_TYPE_NORMAL` and then click on the Slack window. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1827302 Title: 18.10 → 19.04 Alt-Tab cycling no longer includes Slack window To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xfwm4/+bug/1827302/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
