Comment 5 for bug 1762726

A update to Ubuntu received today seems to have fixed the issue.

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$ less /var/log/apt/history.log

Upgrade: gedit:amd64 (3.28.1-1ubuntu1, 3.28.1-1ubuntu1.1), libgweather-3-15:amd64 (3.28.1-1, 3.28.2-1~ubuntu18.04.1), gir1.2-gweather-3.0:amd64 (3.28.1-1, 3.28.2-1~ubuntu18.04.1), gnome-shell-common:amd64 (3.28.3-0ubuntu0.18.04.3, 3.28.3-0ubuntu0.18.04.4), gedit-common:amd64 (3.28.1-1ubuntu1, 3.28.1-1ubuntu1.1), gnome-shell:amd64 (3.28.3-0ubuntu0.18.04.3, 3.28.3-0ubuntu0.18.04.4), libgweather-common:amd64 (3.28.1-1, 3.28.2-1~ubuntu18.04.1)

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I'm no longer able to reproduce the issue.

It seems to have been fixed by this patch:
https://bugs.launchpad.net/ubuntu/+source/ibus/+bug/1765304