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
private IResource getResource() {
			IEditorInput input= fTextEditor.getEditorInput();
			if (input instanceof IFileEditorInput) {
				IFileEditorInput fileInput= (IFileEditorInput) input;
				return fileInput.getFile();
			}
			return null;
		}
		
		/*
		 * @see IResourceChangeListener#resourceChanged(org.eclipse.core.resources.IResourceChangeEvent)
		 */
		public void resourceChanged(IResourceChangeEvent e) {
			IResourceDelta delta= e.getDelta();
			IResource resource= getResource();
			if (delta != null && resource != null) {
				IResourceDelta child= delta.findMember(resource.getFullPath());