Bug 63420 [R21PRES] Flash on tab switch
bundles/org.eclipse.ui.presentations.r21/src/org/eclipse/ui/internal/presentations/R21EditorStackPresentation.java
import org.eclipse.ui.IMemento;
import org.eclipse.ui.IPropertyListener;
import org.eclipse.ui.internal.IPreferenceConstants;
import org.eclipse.ui.internal.IWorkbenchConstants;
import org.eclipse.ui.internal.WorkbenchPlugin;
import org.eclipse.ui.internal.WorkbenchWindow;
import org.eclipse.ui.internal.dnd.DragUtil;
import org.eclipse.ui.internal.presentations.r21.R21Colors;
import org.eclipse.ui.internal.presentations.r21.R21PresentationMessages;
import org.eclipse.ui.internal.presentations.r21.widgets.CTabFolder;
import org.eclipse.ui.internal.presentations.r21.widgets.CTabFolderEvent;
import org.eclipse.ui.internal.presentations.r21.widgets.CTabFolderListener;
import org.eclipse.ui.internal.presentations.r21.widgets.CTabItem;
import org.eclipse.ui.presentations.IPartMenu;
import org.eclipse.ui.presentations.IPresentablePart;
import org.eclipse.ui.presentations.IPresentationSerializer;
import org.eclipse.ui.presentations.IStackPresentationSite;
import org.eclipse.ui.presentations.PresentationUtil;
import org.eclipse.ui.presentations.StackDropResult;
import org.eclipse.ui.presentations.StackPresentation;
/**
 * A stack presentation for editors using a widget set that is close to what was
 * provided in 2.1.
 * <p>
 * EXPERIMENTAL
 * </p>
 * 
 * @since 3.0
 */
public class R21EditorStackPresentation extends StackPresentation {