Bug 55884 Loading a user library from file does not warn when overwriting an existing library [build path]
Works in I2004032400010 + plug-in export for I200403240800 Add library 'mylib'. Save it. Change it. Load library from file. ==> should warn that 'mylib' gets changed.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/UserLibraryPreferencePage.java
fLibraryList.expandElement(newLibrary, AbstractTreeViewer.ALL_LEVELS);
			fLibraryList.selectElements(new StructuredSelection(newLibrary));
		}
	}
	
	private void editArchiveElement(CPListElement existingElement, CPUserLibraryElement parent) {
		CPListElement[] elements= openExtJarFileDialog(existingElement, parent);
		if (elements != null) {
			for (int i= 0; i < elements.length; i++) {
				if (existingElement != null) {
					parent.replace(existingElement, elements[i]);
				} else {
					parent.add(elements[i]);
				}
			}
			fLibraryList.refresh(parent);
			fLibraryList.expandElement(parent, AbstractTreeViewer.ALL_LEVELS);
			fLibraryList.selectElements(new StructuredSelection(parent));
		}
	}
	private void doRemove(List selected) {
		Object selectionAfter= null;
		for (int i= 0; i < selected.size(); i++) {
			Object curr= selected.get(i);
			if (curr instanceof CPUserLibraryElement) {
				fLibraryList.removeElement(curr);
			} else if (curr instanceof CPListElement) {
				Object parent= ((CPListElement) curr).getParentContainer();
				if (parent instanceof CPUserLibraryElement) {
					CPUserLibraryElement elem= (CPUserLibraryElement) parent;