Bug 315281 update copyrights for 3.6
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/extensions/NavigatorContentDescriptorManager.java
firstClassDescriptorsSet.add(descriptor);
					}
				} else {
					String message = 
							"Invalid suppressedExtensionId \"" 
									+ descriptor.getSuppressedExtensionId()
									+ "\" specified from \"" 
									+ descriptor.getId() + "\" in \"" + descriptor.getContribution() 
											.getPluginId()
									+ "\". No extension with matching id found."; 
					if (Policy.DEBUG_EXTENSION_SETUP) {
						System.out.println("Error: " + message); 
					}
					NavigatorPlugin.logError(0, message, null);
				}
			}
		}
	}
	
	private int findId(List list, String id) {
		for (int i = 0, len = list.size(); i < len; i++) {
			NavigatorContentDescriptor desc = (NavigatorContentDescriptor) list.get(i);
			if (desc.getId().equals(id))
				return i;
		}
		throw new RuntimeException("Can't find id: " + id); 
	}
	
	private void computeSequenceNumbers() {
		NavigatorContentDescriptor[] descs = getAllContentDescriptors();