RFR: 8305418: [Linux] Replace obsolete XIM as Input Method Editor [v8]

[Thiago Milczarek Sayao]

On Wed, 20 Sep 2023 23:02:32 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

>> This replaces obsolete XIM and uses gtk api for IME.
>> Gtk uses [ibus](https://github.com/ibus/ibus)
>> 
>> Gtk3+ uses relative positioning (as Wayland does), so I've added a Relative positioning on `InputMethodRequest`.
>> 
>> [Screencast from 17-09-2023 21:59:04.webm](https://github.com/openjdk/jfx/assets/30704286/6c398e39-55a3-4420-86a2-beff07b549d3)
>
> Thiago Milczarek Sayao has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix @Override

This is also a step towards Wayland since it removes X11 specific calls for calls that would work on both X11 and Wayland.

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PR Comment: https://git.openjdk.org/jfx/pull/1080#issuecomment-1737283222