https://bugzilla.redhat.com/show_bug.cgi?id=1659748
--- Comment #9 from Mike FABIAN mfabian@redhat.com --- At first glance I noticed two things in your videos showing the use of ibus-typing-booster in Emacs and LibreOffice:
1) Why is there nothing shown in the gnome-panel when ibus-typing-booster is selected? It is just black. When ibus-typing-booster is selected, 🚀 (U+1F680 ROCKET) should be shown there. Also when switching input methods by typing Super+Space, this rocket emoji should be shown, but in your case there is only black. Don’t you have any emoji font installed? google-noto-emoji-color-fonts-20180814-1.fc29.noarch is a good emoji-font package, I thought this was installed by default. Maybe you lack it because you updated your system.
2) Why does ibus-typing-booster only show the text you just typed and does not show any predictions based on what you typed before or from dictionaries? Maybe you don’t have the si_LK dictionary added in the setup tool of ibus-typing-booster? It can be added in the “Dictionaries and input methods” tab of the setup tool. Or maybe you don’t have hunspell-si installed?