Created attachment 1507332 [details]
On Fedora 29 when using Gnome on Wayland, the preëdit of ibus input methods
is always underlined and the colours are always the same (standard foreground and background). The attributes the ibus engine sets for the preëdit are ignored.
See the attached screen shot which uses the latn-post input method
from ibus-m17n as an example. In the setup tool of that input method,
red is selected as the foreground for the preëdit and yellow as the background and "Underline: None" is selected.
But the ü seen in gedit, which is currently in preëdit, is black on white
*and* it is underlined. It should not be underlined.
On Gnome Xorg, this works.
Created attachment 1507333 [details]
Same procedure using Gnome on Xorg, one can see that the preëdit style
settings work, there is no underline, the foreground is red and the
background is yellow.
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