Bug 320285 Messages inteneded for developers in the error log
The message "unsupported: isEditorAreaVisible" appears in the error log during the normal run of e4 SDK. (For instance, starting the e4 SDK on an clean workspace produces two of those messages.)
bundles/org.eclipse.e4.ui.workbench.addons.swt/src/org/eclipse/e4/ui/workbench/addons/perspectiveswitcher/PerspectiveSwitcher.java
eventBroker.subscribe(UIEvents.buildTopic(UIEvents.ElementContainer.TOPIC,
				UIEvents.ElementContainer.SELECTEDELEMENT), selectionHandler);
	}
	@PreDestroy
	void cleanUp() {
		eventBroker.unsubscribe(toBeRenderedHandler);
		eventBroker.unsubscribe(childrenHandler);
		eventBroker.unsubscribe(selectionHandler);
	}
	@PostConstruct
	void createWidget(Composite parent, MToolControl toolControl) {
		psME = toolControl;
		borderColor = new Color(parent.getDisplay(), 170, 176, 191);
		comp = new Composite(parent, SWT.NONE);
		RowLayout layout = new RowLayout(SWT.HORIZONTAL);
		layout.marginLeft = layout.marginRight = 8;
		layout.marginBottom = 4;
		layout.marginTop = 6;
		comp.setLayout(layout);
		psTB = new ToolBar(comp, SWT.FLAT | SWT.WRAP | SWT.RIGHT);
		comp.addPaintListener(new PaintListener() {
			public void paintControl(PaintEvent e) {
				paint(e);
			}
		});
		toolParent = ((Control) toolControl.getParent().getWidget());
		toolParent.addPaintListener(new PaintListener() {
			public void paintControl(PaintEvent e) {
				e.gc.setForeground(borderColor);
				Rectangle bounds = ((Control) e.widget).getBounds();