Bug 28582 Quickfix icon hides the error icon in editor left ruler [quick fix]
Build 20021216 In presence of problems, one cannot see an error icon in the left ruler, since it get overlapped completely with the quickfix icon. The only error indication is the underlining in the code itself.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitDocumentProvider.java
*/
			public void removeOverlaid(IJavaAnnotation annotation) {
				if (fOverlaids != null) {
					fOverlaids.remove(annotation);
					if (fOverlaids.size() == 0)
						fOverlaids= null;
				}
			}
			
			/*
			 * @see IJavaAnnotation#getOverlaidIterator()
			 */
			public Iterator getOverlaidIterator() {
				if (fOverlaids != null)
					return fOverlaids.iterator();
				return null;
			}
			
			public AnnotationType getAnnotationType() {
				return fType;
			}
		};
		
		/**
		 * Internal structure for mapping positions to some value. 
		 * The reason for this specific structure is that positions can
		 * change over time. Thus a lookup is based on value and not
		 * on hash value.
		 */
		protected static class ReverseMap {