Bug 189847 [DND] Combo/Text on Linux does not fire Drop event.
examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/dnd/DNDExample.java
GridLayout layout = new GridLayout();
	layout.marginWidth = 20;
	defaultParent.setLayout(layout);
	Label label = new Label(defaultParent, SWT.NONE);
	label.setText("Value for default operation is:");
	b = new Button(defaultParent, SWT.RADIO);
	b.setText("DND.DROP_MOVE");
	b.addSelectionListener(new SelectionAdapter() {
		public void widgetSelected(SelectionEvent e) {
			Button b = (Button)e.widget;
			if (b.getSelection()) {
				dropDefaultOperation = DND.DROP_MOVE;
				dropOperation |= DND.DROP_MOVE;
				moveButton.setSelection(true);
				if (dropEnabled) {
					createDropTarget();
				}
			}
		}
	});
	
	b = new Button(defaultParent, SWT.RADIO);
	b.setText("DND.DROP_COPY");
	b.addSelectionListener(new SelectionAdapter() {
		public void widgetSelected(SelectionEvent e) {
			Button b = (Button)e.widget;
			if (b.getSelection()) {
				dropDefaultOperation = DND.DROP_COPY;
				dropOperation |= DND.DROP_COPY;
				copyButton.setSelection(true);