Bug 31113 Don't offer to do a deep copy/move of linked resources
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/SelectionTransferDropAdapter.java
private Button fPreview;
			private MoveRefactoring fRefactoring;
			private Button fReferenceCheckbox;
			private Button fQualifiedNameCheckbox;
			private QualifiedNameComponent fQualifiedNameComponent;
			
			public UpdateDialog(Shell parentShell, MoveRefactoring refactoring) {
				super(parentShell);
				fRefactoring= refactoring;
			}
			protected void configureShell(Shell shell) {
				shell.setText(PackagesMessages.getString("SelectionTransferDropAdapter.dialog.title")); 
				super.configureShell(shell);
			}
			protected void createButtonsForButtonBar(Composite parent) {
				fPreview= createButton(parent, PREVIEW_ID, ReorgMessages.getString("JdtMoveAction.preview"), false); 
				super.createButtonsForButtonBar(parent);
			}
			protected void buttonPressed(int buttonId) {
				if (buttonId == PREVIEW_ID) {
					setReturnCode(PREVIEW_ID);
					close();
				} else {
					super.buttonPressed(buttonId);
				}