RFR: 8236651: Simplify and update glass gtk backend

[Pankaj Bansal]

On Fri, 3 Apr 2020 23:41:49 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

>> I see a lot of work going into this.
>> 
>> In order for this to progress beyond the prototype or concept phase, we will need to have a discussion on the
>> openjfx-dev mailing list in a separate email thread that is not directly tied to the PR -- meaning not a reply to the
>> RFR thread and not a comment in the PR.  @tsayao When you are ready, please send a short email (not a reply to any
>> existing message) to openjfx-dev at openjdk.java.net with the following:
>> 1. A short summary of the proposed enhancement
>> 2. The goals of the proposed enhancement
>> 3. A description of the proposed changes (basically, the bullet items from the description of this PR)
>> 4. A pointer to this PR for reference
>> 
>> I want to focus the openjfx-dev discussion on getting general agreement on the overall approach rather than on the
>> details of the code changes. This is a big change, so getting feedback on the overall goals and approach is important;
>> review comments in the PR aren't the best way to have that discussion.  We aren't following the formal JEP process for
>> JavaFX features, but the JEP template in [JEP 2](https://openjdk.java.net/jeps/2) is a good format to follow for large
>> or high-impact features to make sure that the motivation, goals, and tradeoffs are documented.  Finally, I note that
>> this will eventually need a CSR, but that can be done once there is agreement on the approach, and when this is farther
>> along in the review process.
>
> @kevinrushforth Ok, will do as the instructions. Thanks.

I ran the systemTests on Ubuntu 18.04 using
gradle -PEXTRA_TEST_ARGS='-Djavafx.gtk.experimental=true' -PFULL_TEST=true -PUSE_ROBOT=true :systemTests:cleanTest
:systemTests:test. Following are the results

<img width="969" alt="Results_18 04"
src="https://user-images.githubusercontent.com/6153953/83944842-359d1f00-a824-11ea-964b-f7d9664af9f3.png">

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