I also do not know about the code, but I tested ubuntu mate 18.04 and ibus. Here a similar menu appears, but there is no delay when typing and changing input method. Maybe it could be a hint to fix the bug.
-- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1754702 Title: input method on-screen animation prevents typing To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1754702/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs