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 Object fTarget;
		private static final int PREVIEW_ID= IDialogConstants.CLIENT_ID + 1;
		
		public DragNDropMoveAction(ISelectionProvider provider, Object target){
			super(new MockWorkbenchSite(provider));
			Assert.isNotNull(target);
			fTarget= target;
		}
		
		protected Object selectDestination(ReorgRefactoring ref) {
			return fTarget;
		}
		
		protected boolean isOkToProceed(ReorgRefactoring refactoring) throws JavaModelException {
			if (!super.isOkToProceed(refactoring))
				return false;
			return askIfUpdateReferences((MoveRefactoring)refactoring);
		}
		
		
		private boolean askIfUpdateReferences(MoveRefactoring ref) throws JavaModelException {
			if (! ref.canUpdateReferences() && !ref.canUpdateQualifiedNames()) {
				setShowPreview(false);