Bug 63420 [R21PRES] Flash on tab switch
bundles/org.eclipse.ui.presentations.r21/src/org/eclipse/ui/internal/presentations/R21BasicStackPresentation.java
stack
			if (tabUnderPointer == null) {
				getSite().dragStart(
						paneFolder.getControl().toDisplay(localPos), false);
				return;
			}
			IPresentablePart part = getPartForTab(tabUnderPointer);
			if (getSite().isPartMoveable(part)) {
				getSite().dragStart(part,
						paneFolder.getControl().toDisplay(localPos), false);
			}
		}
	};
	private Listener selectionListener = new Listener() {
		public void handleEvent(Event e) {
			IPresentablePart item = getPartForTab((CTabItem) e.item);
			if (item != null) {
				getSite().selectPart(item);
			}
		}
	};
	private Listener resizeListener = new Listener() {
		public void handleEvent(Event e) {
			setControlSize();
		}
	};
	private IPropertyListener childPropertyChangeListener = new IPropertyListener() {
		public void propertyChanged(Object source, int property) {
			if (source instanceof IPresentablePart) {
				IPresentablePart part = (IPresentablePart) source;