Bug 63420 [R21PRES] Flash on tab switch
bundles/org.eclipse.ui.presentations.r21/src/org/eclipse/ui/internal/presentations/R21EditorStackPresentation.java
private IPresentablePart current;
	
	private MenuManager systemMenuManager = new MenuManager();
	
	private static IPreferenceStore preferenceStore = WorkbenchPlugin
			.getDefault().getPreferenceStore();
	
	
	
	
	private static int tabPos = preferenceStore
			.getInt(IPreferenceConstants.EDITOR_TAB_POSITION);
	
	private final static String TAB_DATA = R21EditorStackPresentation.class
			.getName()
			+ ".partId"; 
	
	private MouseListener mouseListener = new MouseAdapter() {
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.swt.events.MouseListener#mouseDown(org.eclipse.swt.events.MouseEvent)
		 */
		public void mouseDown(MouseEvent e) {
			if (e.widget instanceof Control) {
				Control ctrl = (Control) e.widget;
				Point globalPos = ctrl.toDisplay(new Point(e.x, e.y));
				CTabItem newItem = tabFolder.getItem(tabFolder
						.toControl(globalPos));