Bug 40785 [plan item] Overview ruler improvements
- navigation from ruler to editor - hovering over header area shows number of errors/warning (header annotations in general)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/filebuffers/CompilationUnitDocumentProvider2.java
}
			
			/*
			 * @see AnnotationModel#removeAnnotation(Annotation, boolean)
			 */
			protected void removeAnnotation(Annotation annotation, boolean fireModelChanged) {
				fCurrentEvent.annotationRemoved(annotation);
				
				Position position= getPosition(annotation);
				Object cached= fReverseMap.get(position);
				if (cached instanceof List) {
					List list= (List) cached;
					list.remove(annotation);
					if (list.size() == 1) {
						fReverseMap.put(position, list.get(0));
						list.clear();
					}
				} else if (cached instanceof Annotation) {
					fReverseMap.remove(position);
				}
				super.removeAnnotation(annotation, fireModelChanged);
			}
		}
		
		
		protected static class GlobalAnnotationModelListener implements IAnnotationModelListener, IAnnotationModelListenerExtension {
			
			private ListenerList fListenerList;
			
			public GlobalAnnotationModelListener() {