RFR: 8337400: [Linux] Initial window position is not centered on Ubuntu 24.04 / Xorg

[Kevin Rushforth]

On Mon, 29 Jul 2024 17:46:52 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

> On Ubuntu 24.04 with Xorg windows are not shown centered.
> 
> This is due a configure event being received with position 0,0 which is wrong.
> 
> The fix ignores the configure events until the window is mapped.

I've noticed a few Ubuntu 24.04 failures both on Xorg and on Wayland. I'll test them with this patch.

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PR Comment: https://git.openjdk.org/jfx/pull/1520#issuecomment-2264145178