Product: Fedora https://bugzilla.redhat.com/show_bug.cgi?id=924046
--- Comment #7 from Peng Wu pwu@redhat.com --- I just find a key sequence to trigger this bug for gnome-shell: press Ctrl, press Space, release Ctrl, release Space. The XFCE is not affected by the above key sequence.
Guess in XFCE the switcher key is handled by ibus panel, in gnome-shell this is handled by gnome-settings-daemon.