RFR: 8305418: [Linux] Replace obsolete XIM as Input Method Editor [v22]

[Andy Goryachev]

On Sun, 18 Aug 2024 21:33:46 GMT, Martin Fox <mfox at openjdk.org> wrote:

>> I tested on both XWayland and Xorg. They are never negative.
>> 
>> The input method window did always pop up on the right place.
>> 
>> ![image](https://github.com/user-attachments/assets/05568b82-3602-48d0-acf1-65aabc8a316b)
>> 
>> ![image](https://github.com/user-attachments/assets/14d29bc3-9e57-47c3-b573-f08871306c69)
>
> Interesting. I just did a quick test on the Mac and verified that either coordinate can go negative. There must be a difference in the way the platform's model multiple monitors.

on mac and windows the coordinates can be negative, depending on the screen arrangement.

why do we need to rely on the fact that `pos[]` values are positive anyway?

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PR Review Comment: https://git.openjdk.org/jfx/pull/1080#discussion_r1722063195