Cannot disable IME or set IME position on X11

IME cannot turn off on my system. Even if IME was not enabled for the window, it still receives IME events. set_ime_enabled() has no effect. This can be problematic for applications that don't have IME event handlers.

The relevant code is here. The available styles on my system are: 0x402, 0x404, 0x408, 0x202, 0x204, 0x208. There is no XIM_NONE_STYLE, so the implementation uses the same style (0x402) for "preedit" and "none" modes. None of the available styles actually disable IME.

Setting IME position also doesn't work. There is a comment here, linking to a 20 year old issue. XSetICValues call does, in fact, return an error "preeditAttributes". Does it mean that there is no way to fix it? Setting IME position works in other applications, so it must be possible.

I've played around with other styles. If I enable 0x208 or 0x408, setting IME position actually works, but in these modes the application doesn't receive IME preedit events with actual preedit text (only a single event with an empty preedit, followed by a commit with the final text). So this is also not perfect.

Start with src/platform_impl/linux/x11/ime/input_method.rs around the IME style selection and src/platform_impl/linux/x11/ime/context.rs around the XSetICValues call. Investigate how the listed X11 input styles affect disabling IME, preedit events, and position updates; done means IME can be disabled and its position can be set without losing useful preedit text.