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
/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.e4.ui.workbench.modeling.EModelService#getPerspectiveFor(org.eclipse.e4.ui.model
	 * .application.ui.MUIElement)
	 */
	public MPerspective getPerspectiveFor(MUIElement element) {
		while (true) {
			
			MPlaceholder placeholder = element.getCurSharedRef();
			if (placeholder != null) {
				element = placeholder;
			}
			EObject container = ((EObject) element).eContainer();
			if (container == null || container instanceof MApplication) {
				
				return null;
			} else if (container instanceof MPerspectiveStack) {
				
				return (MPerspective) element;
			}
			
			element = (MUIElement) container;
		}
	}
	public void removePerspectiveModel(MPerspective persp, MWindow window) {
		if (persp == null)
			return;
		for (MWindow win : persp.getWindows()) {