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
SelectionDispatchAction action= ReorgActionFactory.createDnDCopyAction(fElements, ResourceUtil.getResource(target));
		action.run();
	}
	
	
	private static class DragNDropMoveAction extends JdtMoveAction{
		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);