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

[Thiago Milczarek Sayao]

On Wed, 27 Jan 2021 16:39:55 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

>> This does look like a much more manageable approach.
>> 
>> One thing to be aware of from a bookkeeping point of view is that a JBS issues is resolved by a single PR. Once a PR has been integrated for a given JBS bug ID, that bug ID cannot be reused.
>> 
>> This means that each separate PR will need it's own JBS issue to be filed, even if those enhancements taken together are part of a larger set of improvements. Incremental improvements are fine (and in this case a good way to proceed), but you might give some thought to the title of each such improvement. I wouldn't want to see 5 fixes go in each with the same title of `Simplify and update glass gtk backend`.
>
> It's been pointed out about this
> https://stackoverflow.com/questions/49512491/javafx-getting-single-resize-events
> 
> My tests point out that this PR causes less sizing events that the current master branch, but I also think this could be improved further.
> 
> But, by the nature of X and window managers, window sizes does not account decoration frames, but javafx does (probably mimicking windows behavior). Given this information I probably could reduce further the sizing events, but not make it equivalent to windows.

Changed to WIP to reduce sizing events.

-------------

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