Bug 316482 Active tab colour flickers when bringing up the context menu on a view
The tab's colour will flicker between blue and white when you right-click on it.
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/ui/workbench/renderers/swt/WBWRenderer.java
.getProperty(UIEvents.EventTags.NEW_VALUE);
					theShell.setVisible(isVisible);
				}
			}
		};
		eventBroker.subscribe(UIEvents.buildTopic(UIEvents.UIElement.TOPIC,
				UIEvents.UIElement.VISIBLE), visibilityHandler);
		sizeHandler = new EventHandler() {
			public void handleEvent(Event event) {
				if (ignoreSizeChanges)
					return;
				
				Object objElement = event
						.getProperty(UIEvents.EventTags.ELEMENT);
				if (!(objElement instanceof MWindow)) {
					return;
				}
				
				MWindow windowModel = (MWindow) objElement;
				if (windowModel.getRenderer() != WBWRenderer.this) {
					return;
				}
				
				Shell theShell = (Shell) windowModel.getWidget();
				if (theShell == null) {
					return;
				}
				String attName = (String) event
						.getProperty(UIEvents.EventTags.ATTNAME);
				if (UIEvents.Window.X.equals(attName)