Bug 81329 Disable sort member action for enums
Tobias, can you please disable the sort member action for enums. JDT/Core can't fix the problem.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/actions/SortMembersAction.java
private CompilationUnitEditor fEditor;
	private final static String ID= "org.eclipse.jdt.ui.actions.SortMembersAction"; 
	/**
	 * Creates a new <code>SortMembersAction</code>. The action requires
	 * that the selection provided by the site's selection provider is of type <code>
	 * org.eclipse.jface.viewers.IStructuredSelection</code>.
	 * 
	 * @param site the site providing context information for this action
	 */