Bug 308577 e4 applications don't get focus
Upon startup, e4 based applications (including the 4.0 SDK) don't receive focus. Bogdan mentioned that this has to do something with the splash screen.
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/WBWRenderer.java
private EventHandler sizeHandler;
	public WBWRenderer() {
		super();
	}
	MPart activePart = null;
	@Inject
	void trackActivePart(@Optional @Named(IServiceConstants.ACTIVE_PART) MPart p) {
		if (activePart != null) {
			activePart.getTags().remove("active"); 
			MUIElement parent = activePart.getParent();
			if (parent instanceof MPartStack) {
				parent.getTags().remove("active"); 
				setCSSInfo(parent, parent.getWidget());
			} else {
				setCSSInfo(activePart, activePart.getWidget());
			}
		}
		activePart = p;
		if (activePart != null) {
			activePart.getTags().add("active"); 
			MUIElement parent = activePart.getParent();
			if (parent instanceof MPartStack) {
				parent.getTags().add("active"); 
				setCSSInfo(parent, parent.getWidget());
			} else {
				setCSSInfo(activePart, activePart.getWidget());
			}
		}
	}
	@PostConstruct