ADDITIONAL SYSTEM INFORMATION :
MacOs Big Sur 11.2.3 on an Intel MacBook
JavaFX 16+8
JDK 15.0.1+9

A DESCRIPTION OF THE PROBLEM :
On MaxOSX modifier keys are ignoed when dragging and dropping a file from Finder. No matter if I hold cmd or option + cmd while dragging a file on a javafx application, I always receive TransferMode.Copy in the event TransferMode Move and Link are never output.



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Drag a file on the drop target with no modifier
2. Drag a file on the drop target with option key pressed
3. Drag a file on the drop target with option + cmd key pressed



EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
1. Output: Copy
2. Output: Move
3. Output: Link
ACTUAL -
1. Output: Copy
2. Output: Copy
3. Output: Copy

---------- BEGIN SOURCE ----------
Example adapted from https://docs.oracle.com/javafx/2/drag_drop/HelloDragAndDrop.java.html
public class DragAndDropTest extends Application {

    @Override public void start(Stage stage) {
        stage.setTitle("Hello Drag And Drop");

        Group root = new Group();
        Scene scene = new Scene(root, 400, 200);
        scene.setFill(Color.LIGHTGREEN);

        final Text source = new Text(50, 100, "DRAG ME");
        source.setScaleX(2.0);
        source.setScaleY(2.0);

        final Text target = new Text(250, 100, "DROP HERE");
        target.setScaleX(2.0);
        target.setScaleY(2.0);

        source.setOnDragDetected(new EventHandler <MouseEvent>() {
            @Override
            public void handle(MouseEvent event) {
                /* drag was detected, start drag-and-drop gesture*/
                System.out.println("onDragDetected");

                /* allow any transfer mode */
                Dragboard db = source.startDragAndDrop(TransferMode.ANY);

                /* put a string on dragboard */
                ClipboardContent content = new ClipboardContent();
                content.putString(source.getText());
                db.setContent(content);

                event.consume();
            }
        });

        target.setOnDragOver(new EventHandler <DragEvent>() {
            @Override
            public void handle(DragEvent event) {

                if ((event.getGestureSource() != target) &&
                        event.getDragboard().hasFiles()) {
                    event.acceptTransferModes(TransferMode.ANY);
                }

                event.consume();
            }
        });

        target.setOnDragEntered(new EventHandler <DragEvent>() {
            @Override
            public void handle(DragEvent event) {
                /* the drag-and-drop gesture entered the target */
                System.out.println("onDragEntered");
                /* show to the user that it is an actual gesture target */
                if ((event.getGestureSource() != target) &&
                        event.getDragboard().hasString()) {
                    target.setFill(Color.GREEN);
                }

                event.consume();
            }
        });

        target.setOnDragExited(new EventHandler <DragEvent>() {
            @Override
            public void handle(DragEvent event) {
                /* mouse moved away, remove the graphical cues */
                target.setFill(Color.BLACK);

                event.consume();
            }
        });

        target.setOnDragDropped(new EventHandler <DragEvent>() {
            @Override
            public void handle(DragEvent event) {
                /* data dropped */
                System.out.println("onDragDropped");
                /* if there is a string data on dragboard, read it and use it */
                Dragboard db = event.getDragboard();
                boolean success = false;
                if (db.hasFiles()) {
                    System.out.println(event.getTransferMode());

                }
                /* let the source know whether the string was successfully
                 * transferred and used */
                event.setDropCompleted(success);

                event.consume();
            }
        });

        source.setOnDragDone(new EventHandler <DragEvent>() {
            @Override
            public void handle(DragEvent event) {
                /* the drag-and-drop gesture ended */
                System.out.println("onDragDone");
                /* if the data was successfully moved, clear it */
                if (event.getTransferMode() == TransferMode.MOVE) {
                    source.setText("");
                }

                event.consume();
            }
        });

        root.getChildren().add(source);
        root.getChildren().add(target);
        stage.setScene(scene);
        stage.show();
    }

    public static void main(String[] args) {
        Application.launch(args);
    }
}
---------- END SOURCE ----------

FREQUENCY : always