RFR: 8354943: [Linux] Simplify and update glass gtk backend: window sizing, positioning, and state management issues [v18]

[Thiago Milczarek Sayao]

On Sun, 11 May 2025 12:20:55 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

>> Sorry, my bad, you're right. I now hide in shame..
>
> Fixed it.

Those tests aren't ok, I will redo it.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1789#discussion_r2114495737