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
private boolean fShowPreview= false;
	public JdtMoveAction(IWorkbenchSite site) {
		super(site);
		setText(ReorgMessages.getString("moveAction.label"));
	}
	public boolean canOperateOn(IStructuredSelection selection) {
		if (selection.isEmpty())
			return false;
		if (ClipboardActionUtil.hasOnlyProjects(selection))
			return selection.size() == 1;
		else
			return super.canOperateOn(selection);
	}
	
	protected void run(IStructuredSelection selection) {
		if (ClipboardActionUtil.hasOnlyProjects(selection)){
			moveProject(selection);
		}	else {
			super.run(selection);
		}
	}
	/* non java-doc
	 * see @ReorgDestinationAction#isOkToProceed
	 */