Bug 69240 [reconciling] Editor shows "stale" compilation error
Eclipse has always has a small problem in that occaisionally it would show an error in the editor window (red-squiggly, with a marker) even though the error had been fixed and no longer appeared in the Tasks/Problem view. I usually just type "Space-Backspace" and save the file and it goes away. In 3.0, this is MUCH more frequent. I'm not 100% sure of the cause, but every time I've seen in it recently, file A will have a problem, and then I'll change file B to fix it. I'll pay more attention, and see if I can obtain any more details.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/JavaReconciler.java
if (child != null) {
					IMarkerDelta[] deltas= child.getMarkerDeltas();
					if (deltas.length > 0)
						forceReconciling();
				}
			}
		}
	}
	
	
	
	private ITextEditor fTextEditor;
	
	private IPartListener fPartListener;
	
	private ShellListener fActivationListener;
	/**
	 * The mutex that keeps us from running multiple reconcilers on one editor.
	 * TODO remove once we have ensured that there is only one reconciler per editor. 
	 */
	private Object fMutex;
	/**
	 * The Java element changed listener.
	 * @since 3.0
	 */
	private IElementChangedListener fJavaElementChangedListener;
	/**
	 * Tells whether the Java model sent out a changed event.
	 * @since 3.0
	 */