Bug 68586 [implementation] Reconciling should be more robust
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitDocumentProvider.java
for (Iterator e = list.iterator(); e.hasNext();)
						setOverlay(e.next(), problemAnnotation);
				} else {
					setOverlay(value, problemAnnotation);
				}
			}
			
			/**
			 * Tells this annotation model to collect temporary problems from now on.
			 */
			private void startCollectingProblems() {
				fGeneratedAnnotations= new ArrayList();  
			}
			
			/**
			 * Tells this annotation model to no longer collect temporary problems.
			 */
			private void stopCollectingProblems() {
				if (fGeneratedAnnotations != null)
					removeAnnotations(fGeneratedAnnotations, true, true);
				fGeneratedAnnotations= null;
			}
			
			/*
			 * @see IProblemRequestor#isActive()
			 */
			public boolean isActive() {
				return fIsActive;
			}