RFR: 8305418: [Linux] Replace obsolete XIM as Input Method Editor [v31]

[Thiago Milczarek Sayao]

On Sun, 15 Dec 2024 19:09:29 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

>> Anyway, current solution without checking `im_ctx.on_preedit` can work well. I backported it to `jfx22` and it worked well. Thanks again. And hope for the final solution.
>
> This option sets if editing happens on the application or in the IME window.
> 
> Application:
> ![image](https://github.com/user-attachments/assets/d44364ad-4090-4e1d-9fcf-5fa7fbd8a306)
> 
> 
> IME Window:
> ![image](https://github.com/user-attachments/assets/692536bf-e8d2-467d-9332-0a6f04f1eb9a)

I modified it to no longer rely on pre-edit calls, but I'm not sure if it's working as expected yet.

-------------

PR Review Comment: https://git.openjdk.org/jfx/pull/1080#discussion_r1885846316