RFR: 8225571: Port DND source to use GTK instead of GDK

Wed Dec 11 19:06:06 UTC 2019

On Wed, 11 Dec 2019 18:43:23 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> I don't get an assertion error on Oracle Linux 7.7 -- so far only on Ubuntu 16.04. I will resume reviewing once you restore the `DRAG_DONE` behavior.
> 
> With your latest patch, which reverts the changes to `GtkDnDClipboard.java`, I now get the DRAG_DONE event, but the following warning printed to the console in the case of a `DRAG_DONE` event with a null transfer mode:
> 
> GOT A dragExit when dndGesture is null!
> 
> This is coming from [Scene.java#L2925](https://github.com/openjdk/jfx/blob/master/modules/javafx.graphics/src/main/java/javafx/scene/Scene.java#L2925).

My mistake. I saw that and thought it was from the test app.

Will fix.

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PR: https://git.openjdk.java.net/jfx/pull/4