Bug 63420 [R21PRES] Flash on tab switch
bundles/org.eclipse.ui.presentations.r21/src/org/eclipse/ui/internal/presentations/R21BasicStackPresentation.java
CTabItem newItem = paneFolder.getItem(paneFolder.getControl()
						.toControl(globalPos));
				if (newItem != null) {
					CTabItem oldItem = paneFolder.getSelection();
					if (newItem != oldItem)
						return;
				}
				if (current != null) {
					current.setFocus();
				}
			}
		}
		public void mouseDoubleClick(MouseEvent e) {
			if (getSite().getState() == IStackPresentationSite.STATE_MAXIMIZED) {
				getSite().setState(IStackPresentationSite.STATE_RESTORED);
			} else {
				getSite().setState(IStackPresentationSite.STATE_MAXIMIZED);
			}
		}
	};
	private MouseListener titleMouseListener = new MouseAdapter() {
		public void mouseDown(MouseEvent e) {
			if (e.widget instanceof Control) {
				Control ctrl = (Control) e.widget;
				Point globalPos = ctrl.toDisplay(new Point(0, titleLabel
						.getBounds().height));
				if ((e.button == 1) && overImage(e.x))