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/src/org/eclipse/e4/ui/internal/workbench/ModelServiceImpl.java
IPresentationEngine renderingEngine = persp.getContext().get(IPresentationEngine.class);
			Object foo = renderingEngine.createGui(newWindow, window.getWidget(),
					persp.getContext());
			if (foo != null)
				System.out.println(foo.toString());
		} else if (curParent instanceof MWindow) {
			((MWindow) curParent).getWindows().add(newWindow);
		}
	}
	/**
	 * @param element
	 * @return
	 */
	private MWindowElement wrapElementForWindow(MPartSashContainerElement element) {
		if (element instanceof MWindowElement)
			return (MWindowElement) element;
		if (element instanceof MPlaceholder) {
			MUIElement ref = ((MPlaceholder) element).getRef();
			if (ref instanceof MPart) {
				MPartStack newPS = MBasicFactory.INSTANCE.createPartStack();
				newPS.getChildren().add((MPlaceholder) element);
				return newPS;
			}
		}
		return null;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see