RFR: WIP: 8260528: Clean glass-gtk sizing and positioning code

Wed Mar 3 12:18:07 UTC 2021

On Thu, 18 Feb 2021 21:24:31 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

>> Current Status:
>> 
>> ![image](https://user-images.githubusercontent.com/30704286/108422319-2aa0e800-7215-11eb-8b9e-8f62e7f8d553.png)
>
> Ready to be reviewed.

Changed to WIP while we run some more tests to make sure latest changes are ok.
I'm fixing some residual "extra resize" issues (these issues exists on the current versions, so this makes it better, hopefully).

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PR: https://git.openjdk.java.net/jfx/pull/367