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/reorg/JdtMoveAction.java
fShowPreview = showPreview;
	}
	
	private static boolean isOkToMoveReadOnly(ReorgRefactoring refactoring){
		if (! hasReadOnlyElements(refactoring))
			return true;
		
		return  MessageDialog.openQuestion(
				JavaPlugin.getActiveWorkbenchShell(),
				ReorgMessages.getString("moveAction.checkMove"),  
				ReorgMessages.getString("moveAction.error.readOnly")); 
	}
	
	private static boolean hasReadOnlyElements(ReorgRefactoring refactoring){
		for (Iterator iter= refactoring.getElementsToReorg().iterator(); iter.hasNext(); ){
			if (ReorgUtils.shouldConfirmReadOnly(iter.next())) 
				return true;
		}
		return false;
	}
		
	/* non java-doc
	 * @see ReorgDestinationAction#doReorg(ReorgRefactoring) 
	 */
	void doReorg(ReorgRefactoring refactoring) throws JavaModelException{
		if (fShowPreview){		
			
			RefactoringWizard wizard= new RefactoringWizard(refactoring, ReorgMessages.getString("JdtMoveAction.move"), IJavaHelpContextIds.MOVE_CU_ERROR_WIZARD_PAGE); 
	        wizard.setChangeCreationCancelable(false);
			new RefactoringWizardDialog(JavaPlugin.getActiveWorkbenchShell(), wizard).open();