RFR: 8326712: Robot tests fail on XWayland

[Kevin Rushforth]

On Fri, 28 Jun 2024 08:01:09 GMT, Alexander Zvegintsev <azvegint at openjdk.org> wrote:

>> With the headless platform that I started in the sandbox project, there is the concept of headless, but rather than compiling native code with `#ifdef HEADLESS` the current approach is to avoid those native compilations at all.
>> However, I don't exclude that some parts of a file might make sense for a headless glass platform, where other parts should not be considered. In that case, the `ifdef HEADLESS` and in general the compile option `-DHEADLESS` would make sense.
>> While this is not needed at this moment (and not even sure it will ever be needed), I am slightly in favor of keeping it here.
>
> I already did the removal earlier, but I can bring it back once we come to an agreement.

Johan makes a good point, so go ahead and add it back.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1490#discussion_r1658725278