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
super.cancelPressed();
	}
	private void setInitialSelection() {
		List selections= getInitialElementSelections();
		if (!selections.isEmpty()) {
			fTableViewer.setCheckedElements(selections.toArray());
		}
	}
	private void createWorkingSet() {
		IWorkingSetManager manager= PlatformUI.getWorkbench().getWorkingSetManager();
		IWorkingSetNewWizard wizard= manager.createWorkingSetNewWizard(new String[] {JavaWorkingSetUpdater.ID});
		
		WizardDialog dialog= new WizardDialog(getShell(), wizard);
		dialog.create();
		if (dialog.open() == Window.OK) {
			IWorkingSet workingSet= wizard.getSelection();
			Filter filter= new Filter();
			if (filter.select(null, null, workingSet)) {
				fElements.add(workingSet);
				fTableViewer.add(workingSet);
				fTableViewer.setSelection(new StructuredSelection(workingSet), true);
				fTableViewer.setChecked(workingSet, true);
				manager.addWorkingSet(workingSet);
				fAddedWorkingSets.add(workingSet);
			}
		}
	}
	private void editSelectedWorkingSet() {
		IWorkingSetManager manager= PlatformUI.getWorkbench().getWorkingSetManager();
		IWorkingSet editWorkingSet= (IWorkingSet)((IStructuredSelection)fTableViewer.getSelection()).getFirstElement();