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
postSyncRunnable(new Runnable() {
			public void run() {
				if(isDisposed()) 
					return;
				for (Enumeration e= fTestRunTabs.elements(); e.hasMoreElements();) {
					TestRunTab v= (TestRunTab) e.nextElement();
					v.startTest(testId);
				}
			}
		});	
	}
	private void handleEndTest() {
		
		fProgressBar.step(fFailureCount+fErrorCount);
		if (fShowOnErrorOnly) {
			Image progress= fProgressImages.getImage(fExecutedTests, fTestCount, fErrorCount, fFailureCount);
			if (progress != fViewImage) {
				fViewImage= progress;
				firePropertyChange(IWorkbenchPart.PROP_TITLE);
			}
		}
	}
	private void refreshCounters() {
		fCounterPanel.setErrorValue(fErrorCount);
		fCounterPanel.setFailureValue(fFailureCount);
		fCounterPanel.setRunValue(fExecutedTests);
		fProgressBar.refresh(fErrorCount+fFailureCount> 0);
	}
	protected void postShowTestResultsView() {
		postSyncRunnable(new Runnable() {