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
delete.setCanDeleteGetterSetter(false);
				delete.update(delete.getSelection());
				if (delete.isEnabled())
					delete.run();
				
			} else if (event.detail == DND.DROP_COPY) {
				handleDropCopy(target, event);
			} else if (event.detail == DND.DROP_LINK) {
				handleDropLink(target, event);
			}
			
		} catch (JavaModelException e){
			ExceptionHandler.handle(e, PackagesMessages.getString("SelectionTransferDropAdapter.error.title"), PackagesMessages.getString("SelectionTransferDropAdapter.error.message")); 
		}	finally{
			
			
			
			event.detail= DND.DROP_NONE;
		}
	}
	
	private int handleValidateDefault(Object target, DropTargetEvent event) throws JavaModelException{
		if (target == null)
			return DND.DROP_NONE;
			
		if (canPasteSourceReferences(target))	
			return handleValidateCopy(target, event);
		else
			return handleValidateMove(target, event);	
	}