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

[Thiago Milczarek Sayao]

On Wed, 7 May 2025 20:36:18 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

>> When stage2 is created you pass in stage0 as the owner, not stage1.
>
> Sorry, my bad, you're right. I now hide in shame..

Fixed it.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1789#discussion_r2083509590