This bug was fixed in the package gnome-flashback - 3.28.0-1ubuntu1.4
--------------- gnome-flashback (3.28.0-1ubuntu1.4) bionic; urgency=medium
* Backport two upstream commits to fix ibus indicator flickering (LP: #1836659).
-- Dmitry Shachnev <email address hidden> Tue, 23 Jul 2019 16:09:36 +0300
This bug was fixed in the package gnome-flashback - 3.28.0-1ubuntu1.4
---------------
gnome-flashback (3.28.0-1ubuntu1.4) bionic; urgency=medium
* Backport two upstream commits to fix ibus indicator flickering
(LP: #1836659).
-- Dmitry Shachnev <email address hidden> Tue, 23 Jul 2019 16:09:36 +0300