ibus failed to trigger in apps running on org.kde.Platform

[Robin Lee]

Hi,

I tested three Qt-based flatpaks, telegram desktop, krita and
kdenlive, today. In any
of them I fail to trigger ibus input method. IBus input context is
already loaded.

I am running on Fedora 26 gnome-xorg.

Non-flatpak application works well, including telegram desktop
installed from RPMFusion.
Gtk-based flatpak also works.

-robin