Bug 65839 [JUnit] update job leaks
There are situations when the JUnit update jobs are not properly stopped. Need to add safety checks to make sure that the update job is stopped.
org.eclipse.jdt.junit/src/org/eclipse/jdt/internal/junit/ui/TestRunnerViewPart.java
* A ViewPart that shows the results of a test run.
 */
public class TestRunnerViewPart extends ViewPart implements ITestRunListener3, IPropertyChangeListener {
	public static final String NAME= "org.eclipse.jdt.junit.ResultView"; 
	public static final String ID_EXTENSION_POINT_TESTRUN_TABS= JUnitPlugin.PLUGIN_ID + "." + "internal-testRunTabs"; 
	static final int REFRESH_INTERVAL= 200;
 	/**
 	 * Number of executed tests during a test run
 	 */
	protected volatile int fExecutedTests;
	/**
	 * Number of errors during this test run
	 */
	protected volatile int fErrorCount;
	/**
	 * Number of failures during this test run
	 */
	protected volatile int fFailureCount;
	/**
	 * Number of tests run
	 */
	protected volatile int fTestCount;
	/**
	 * Whether the output scrolls and reveals tests as they are executed.
	 */
	protected boolean fAutoScroll = true;
	/**
	 * The current orientation; either <code>VIEW_ORIENTATION_HORIZONTAL</code>
	 * <code>VIEW_ORIENTATION_VERTICAL</code>, or <code>VIEW_ORIENTATION_AUTOMATIC</code>.
	 */