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

Sat Mar 6 23:56:17 UTC 2021

On Wed, 3 Mar 2021 12:14:47 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

>> Changed to WIP to reduce sizing events.
>
> 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).

Looks good now.

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