Bug 220559 Regression in some open editor performance tests
Verifying build I20080226-1155, it looks like some open editors tests are seriously red: - OpenJavaEditorTest#testOpenEditor3(): between -16.1% and -36% - OpenJavaEditorTest#testOpenEditor4(): between -18.1% and -39.2%
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/CommonNavigator.java
* </p>
	 * <p>
	 * This method will be invoked when the DisposeListener is notified of the
	 * disposal of the Eclipse view part.
	 * </p>
	 * 
	 * @see org.eclipse.ui.part.WorkbenchPart#dispose()
	 */
	public void dispose() {
		if (commonManager != null) {
			commonManager.dispose();
		}
		if(commonActionGroup != null) {
			commonActionGroup.dispose();
		}
		super.dispose();
	}
	/**
	 * <p>
	 * Note: This method is for internal use only. Clients should not call this
	 * method.
	 * </p>
	 * 
	 * @see org.eclipse.ui.part.ViewPart#init(org.eclipse.ui.IViewSite,
	 *      org.eclipse.ui.IMemento)
	 */
	public void init(IViewSite aSite, IMemento aMemento)
			throws PartInitException {
		super.init(aSite, aMemento);
		memento = aMemento;