Bug 52801 "Press F2 for focus" does not work for spell-checking hovers
"Press F2 for focus" does not work for spell-checking hovers.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
IDocument document= getSourceViewer().getDocument();
		if (document == null)
			return;
				
		if (fOccurrencesFinderJob != null)
			fOccurrencesFinderJob.cancel();
		
		ExceptionOccurrencesFinder exceptionFinder= new ExceptionOccurrencesFinder();
		String message= exceptionFinder.initialize(astRoot, selection.getOffset(), selection.getLength());
		List matches= new ArrayList();
		if (message == null) {
			matches= exceptionFinder.perform();
		}
		if (matches.size() == 0) {
			ASTNode node= NodeFinder.perform(astRoot, selection.getOffset(), selection.getLength());
			if (!(node instanceof Name)) {
				if (!fStickyOccurrenceAnnotations)
					removeOccurrenceAnnotations();
				return;
			}
			
			IBinding binding= ((Name)node).resolveBinding();
			if (binding == null && fStickyOccurrenceAnnotations)
				return;
			
			
			OccurrencesFinder finder = new OccurrencesFinder(binding);
			message= finder.initialize(astRoot, selection.getOffset(), selection.getLength());
			if (message == null) {