RFR: 8260528: Clean glass-gtk sizing and positioning code [v38]

Sat Jan 21 15:10:21 UTC 2023

On Thu, 22 Dec 2022 22:08:15 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Thiago Milczarek Sayao has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix redraw bug (black header)
>
> On my system, the latest change you made didn't make any difference. Not sure why.
> 
> One other observation, which may or may not be related. The system test `InitialSizeTest` fails now 100% of the time on Ubuntu 16.04. The requested Stage size is 200 and the actual size is 228.

@kevinrushforth If you have some time to look at it again I would appreciate. I am interested in getting this PR merged so I can improve it further.

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PR: https://git.openjdk.org/jfx/pull/915