https://bugzilla.redhat.com/show_bug.cgi?id=1960390
--- Comment #2 from Akira TAGOH tagoh@redhat.com --- That warning message says it all. this isn't really new. please ask GNOME upstream for the way of changing the input methods to your favarite one. imsettings just followed that but there are nothing such things anymore. it can't do any help without their support.
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