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
/**
	 * {@inheritDoc}
	 */
	protected Control createDialogArea(Composite parent) {
		Composite composite= (Composite)super.createDialogArea(parent);
		composite.setFont(parent.getFont());
		createMessageArea(composite);
		Composite inner= new Composite(composite, SWT.NONE);
		inner.setFont(composite.getFont());
		inner.setLayoutData(new GridData(GridData.FILL_BOTH));
		GridLayout layout= new GridLayout();
		layout.numColumns= 2;
		layout.marginHeight= 0;
		layout.marginWidth= 0;
		inner.setLayout(layout);
		createTableViewer(inner);
		createOrderButtons(inner);
		createModifyButtons(composite);
		fTableViewer.setInput(fElements);
		return composite;
	}
	private void createTableViewer(Composite parent) {
		fTableViewer= CheckboxTableViewer.newCheckList(parent, SWT.BORDER | SWT.MULTI);
		fTableViewer.addCheckStateListener(new ICheckStateListener() {
			public void checkStateChanged(CheckStateChangedEvent event) {
				updateButtonAvailability();
			}
		});
		GridData data= new GridData(GridData.FILL_BOTH);
		data.heightHint= convertHeightInCharsToPixels(20);