Bug 114512 [working sets] Package explorer should only allow working sets that have an updater installed
I20051101-0010 The package explorer started to support working sets different than the Java working set. However, the package explorer must ensure that an working set updater is installed otherwise it will end up showing stale/bogus content.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/workingsets/WorkingSetConfigurationDialog.java
if (p == null || !p.exists())
					return false;
			}
			return true;
		}
	}
	private List fElements;
	private CheckboxTableViewer fTableViewer;
	private Button fNewButton;
	private Button fEditButton;
	private Button fRemoveButton;
	private Button fUpButton;
	private Button fDownButton;
	private Button fSelectAll;
	private Button fDeselectAll;
	private IWorkingSet[] fResult;
	private List fAddedWorkingSets;
	private List fRemovedWorkingSets;
	private Map fEditedWorkingSets;
	private List fRemovedMRUWorkingSets;
	private int nextButtonId= IDialogConstants.CLIENT_ID + 1;
	public WorkingSetConfigurationDialog(Shell parentShell, IWorkingSet[] workingSets) {
		super(parentShell);
		setTitle(WorkingSetMessages.WorkingSetConfigurationDialog_title); 
		setMessage(WorkingSetMessages.WorkingSetConfigurationDialog_message); 
		fElements= new ArrayList(workingSets.length);
		Filter filter= new Filter();
		for (int i= 0; i < workingSets.length; i++) {
			if (filter.select(null, null, workingSets[i]))
				fElements.add(workingSets[i]);