I'm not able to spot the root cause for the problem with the ibus-mozc suggestion window, but I have tested on Ubuntu, Ubuntu on Xorg and Unity both with GDM and LightDM. The suggestion window failed to show up with the combination Wayland + LightDM, but that's an odd combo anyway, and the other tests were successful.
I'm not able to spot the root cause for the problem with the ibus-mozc suggestion window, but I have tested on Ubuntu, Ubuntu on Xorg and Unity both with GDM and LightDM. The suggestion window failed to show up with the combination Wayland + LightDM, but that's an odd combo anyway, and the other tests were successful.
So I uploaded to the queue.