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
protected void configureSourceViewerDecorationSupport(SourceViewerDecorationSupport support) {
		
		support.setCharacterPairMatcher(fBracketMatcher);
		support.setMatchingCharacterPainterPreferenceKeys(MATCHING_BRACKETS, MATCHING_BRACKETS_COLOR);
		
		super.configureSourceViewerDecorationSupport(support);
	}
	
	/*
	 * @see org.eclipse.ui.texteditor.AbstractTextEditor#gotoMarker(org.eclipse.core.resources.IMarker)
	 */
	public void gotoMarker(IMarker marker) {
		fLastMarkerTarget= marker;
		if (!fIsUpdatingAnnotationViews) {
		    super.gotoMarker(marker);
		}
	}
	
	/**
	 * Jumps to the next enabled annotation according to the given direction.
	 * An annotation type is enabled if it is configured to be in the
	 * Next/Previous tool bar drop down menu and if it is checked.
	 * 
	 * @param forward <code>true</code> if search direction is forward, <code>false</code> if backward
	 */
	public void gotoAnnotation(boolean forward) {
		ITextSelection selection= (ITextSelection) getSelectionProvider().getSelection();
		Position position= new Position(0, 0);
		if (false ) {