Bug 299685 Empty iconURI's cause 'MalformedURLException' failures rather than being ignored
One of the issues Lars' found is that if you fill in a field (i.e. iconURI) and subsequently clear it you don't end up in the same model state. Once the value has been set in the editor it will never be 'null' again, clearing the field just sets it to an empty string.
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/WBWRenderer.java
private class WindowSizeUpdateJob implements Runnable {
		public List<MWindow> windowsToUpdate = new ArrayList<MWindow>();
		public void run() {
			clearSizeUpdate();
			while (!windowsToUpdate.isEmpty()) {
				MWindow window = windowsToUpdate.remove(0);
				Shell shell = (Shell) window.getWidget();
				if (shell == null || shell.isDisposed())
					return;
				shell.setBounds(window.getX(), window.getY(),
						window.getWidth(), window.getHeight());
			}
		}
	}
	WindowSizeUpdateJob boundsJob;
	void clearSizeUpdate() {
		boundsJob = null;
	}
	boolean ignoreSizeChanges = false;
	@Inject
	Logger logger;
	@Inject
	private IEventBroker eventBroker;
	private EventHandler shellUpdater;
	private EventHandler visibilityHandler;
	private EventHandler sizeHandler;
	public WBWRenderer() {
		super();
	}
	@PostConstruct