Bug 29698 drag and drop of java files between packages in package explorer doesn't work
the <preview> <ok> <cancel> dialog shows up, but <ok> has the same effect as <cancel> and <preview> would only show movements of files and no changes in imports of other java files. on <ok> in the preview it only moves the file(s) (as indicated ) without changing referencing imports.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/SelectionTransferDropAdapter.java
private List fElements;
	private MoveRefactoring fMoveRefactoring;
	private int fCanMoveElements;
	private CopyRefactoring fCopyRefactoring;
	private int fCanCopyElements;
	private ISelection fSelection;
	private AddMethodStubAction fAddMethodStubAction;
	
	private static final int DROP_TIME_DIFF_TRESHOLD= 150;
	public SelectionTransferDropAdapter(StructuredViewer viewer) {
		super(viewer, DND.FEEDBACK_SCROLL | DND.FEEDBACK_EXPAND);
		fAddMethodStubAction= new AddMethodStubAction();
	}
	
	
	public Transfer getTransfer() {
		return LocalSelectionTransfer.getInstance();
	}
	
	
	public void dragEnter(DropTargetEvent event) {
		clear();
		super.dragEnter(event);
	}
	
	public void dragLeave(DropTargetEvent event) {
		clear();
		super.dragLeave(event);