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
if (clazz != null && !(clazz.isInstance(element)))
			return false;
		if (tagsToMatch != null) {
			List<String> elementTags = element.getTags();
			for (String tag : tagsToMatch) {
				if (!elementTags.contains(tag))
					return false;
			}
		}
		return true;
	}
	private <T> void findElementsRecursive(MUIElement searchRoot, String id,
			Class<? extends T> type, List<String> tagsToMatch, List<T> elements) {
		
		if (match(searchRoot, id, type, tagsToMatch)) {
			if (!elements.contains((T) searchRoot))
				elements.add((T) searchRoot);
		}
		
		if (searchRoot instanceof MElementContainer<?>) {
			MElementContainer<MUIElement> container = (MElementContainer<MUIElement>) searchRoot;
			List<MUIElement> children = container.getChildren();
			for (MUIElement child : children) {
				findElementsRecursive(child, id, type, tagsToMatch, elements);
			}
		}
		
		if (searchRoot instanceof MTrimmedWindow) {
			MTrimmedWindow tw = (MTrimmedWindow) searchRoot;
			List<MTrimBar> bars = tw.getTrimBars();