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#detach(org.eclipse.e4.ui.model.application
	 * .MPartSashContainerElement)
	 */
	public void detach(MPartSashContainerElement element, int x, int y, int width, int height) {
		
		MUIElement curParent = element.getParent();
		while (curParent != null && !(curParent instanceof MPerspective)
				&& !(curParent instanceof MWindow))
			curParent = curParent.getParent();
		if (curParent == null)
			return; 
		MTrimmedWindow newWindow = BasicFactoryImpl.INSTANCE.createTrimmedWindow();
		
		newWindow.setX(x);
		newWindow.setY(y);
		newWindow.setWidth(width);
		newWindow.setHeight(height);
		element.getParent().getChildren().remove(element);
		MWindowElement uiRoot = wrapElementForWindow(element);
		newWindow.getChildren().add(uiRoot);
		if (curParent instanceof MPerspective) {
			MPerspective persp = (MPerspective) curParent;
			persp.getWindows().add(newWindow);
			MWindow window = getTopLevelWindowFor(persp);