XIM is disabled for working around a X11 issue: https://github.com/ValveSoftware/wine/commit/557144d3b78b1dbe1b8e9dc14e2e6ccda2a1c11d#diff-adc23fa7bcadeff404bb73143ff1699f

There is some information about how you can work around this issue here: https://github.com/ValveSoftware/Proton/issues/3528#issuecomment-589828273

XIM is disabled for working around a X11 issue: ValveSoftware/wine@557144d#diff-adc23fa7bcadeff404bb73143ff1699f

i try XIM disabled and enabled but ibus · fxitc not work on ptoron.

XIM is disabled for working around a X11 issue: ValveSoftware/wine@557144d#diff-adc23fa7bcadeff404bb73143ff1699f

Though, with xim enabled, Compose key won't work on client side. But with a proper implemented input method server (e.g. fcitx), the compose key will be handled on input method server side. Disabling XIM is not the right approach for the problem. Or at least, this should be able to be configured (e.g. environment variable).

@wengxt We disable XIM because libx11 has a bug that causes a crash. We can't work around this in Wine. We're trying to upstream a fix into libx11 but they haven't been very responsive. It is configurable. See the link I posted earlier in this thread. If you get lucky your application may not crash.

Here's alternative xim handler wrote in Rust.
Can this be solution?

https://github.com/Riey/xim-rs

XIM is no longer disabled by default with Proton 9.0-beta. Could anyone impacted by this please retest and see if XIM input is now behaving as they would expect with Proton 9.0-beta?