Bug 65243 Build path dialog: Disable 'Add folder' when ex-/inclusion selected
RC1 On the build path dialog it would be better to disable 'Add folder' when ex-/inclusion selected to avoid confusion to what 'Add folder is releated'
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/LibrariesWorkbookPage.java
for (int i= selElements.size() - 1; i >= 0 ; i--) {
			Object elem= selElements.get(i);
			if (elem instanceof CPListElementAttribute) {
				CPListElementAttribute attrib= (CPListElementAttribute) elem;
				attrib.getParent().setAttribute(attrib.getKey(), null);
				selElements.remove(i);				
			}
		}
		if (selElements.isEmpty()) {
			fLibrariesList.refresh();
			fClassPathList.dialogFieldChanged(); 
		} else {
			fLibrariesList.removeElements(selElements);
		}
	}
	
	private boolean canRemove(List selElements) {
		if (selElements.size() == 0) {
			return false;
		}
		for (int i= 0; i < selElements.size(); i++) {
			Object elem= selElements.get(i);
			if (elem instanceof CPListElementAttribute) {
				if (((CPListElementAttribute)elem).getValue() == null) {
					return false;
				}
			} else if (elem instanceof CPListElement) {
				CPListElement curr= (CPListElement) elem;
				if (curr.getParentContainer() != null) {
					return false;