Call for testing: Drag and Drop on Linux

[Thiago Milczarek Sayao]

Dear Linux Users,

I did some modifications on DND to work better with Linux:

https://github.com/javafxports/openjdk-jfx/pull/490

Benefits:

  *   Works on wayland
  *   Works across gtk2 and gtk3 with little code differences
  *   Works on scenebuilder (with gtk3 - currently it falls back to gtk2)
  *   Will be easier to port to GTK4 when it's default (may take some time).

I have tested on Ubuntu 16.04, 18.04 and 19.04.

Please, give feedback on the Pull Request.

On the source there are two test apps included (tests/manual/dnd).

Can be also tested with scenebuilder (which uses drag and drop):

  *   Clone de source https://github.com/gluonhq/scenebuilder
  *   Build: gradlew build
  *   Run:  java --module-path <PATH TO OPENJFX SOURCE>/openjdk-jfx/build/sdk/lib --add-modules javafx.web,javafx.fxml,javafx.swing,javafx.media --add-opens=javafx.fxml/javafx.fxml=ALL-UNNAMED -cp app/build/libs/scenebuilder-11.0.0-SNAPSHOT.jar com.oracle.javafx.scenebuilder.app.SceneBuilderApp