741dd674f6
It indirectly triggers expensive operations in gnome-shell (js/ui/keyboard.js), which turns out too expensive if we happen to operate the shell simultaneously with 2 devices that will trigger the operations there. So just rate limit the signal emission, defer to an idle and just emit the last device gotten. Worst that will happen is that we may possibly emit the signal on the same device consecutively. https://bugzilla.gnome.org/show_bug.cgi?id=753527