RFR: 8236651: Simplify and update glass gtk backend

Wed Jul 29 20:48:27 UTC 2020

On Wed, 29 Jul 2020 02:39:31 GMT, Tor (torbuntu) <github.com+17347324+Torbuntu at openjdk.org> wrote:

>>> If you want these commits to be preserved when you integrate, you will need to make a 'merge-style' pull request.
>> 
>> Please ignore this information from Skara. I don't know what caused it, but I've pinged the Skara folks about it.
>
> Would it be possible and related to add the gtk touch events to this PR as part of the Glass GTK3 update? Or would
> follow up update PR adding that be more appropriate?
> Currently linux desktop does not have touch support because of the missing gesture/touch events from gtk3.

@Torbuntu Not to this PR, I don't want to delay it too much. But can be done (I just do not own a touch device
currently).

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PR: https://git.openjdk.java.net/jfx/pull/77