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
/*
	 * @see org.eclipse.jface.text.reconciler.AbstractReconciler#aboutToReconcile()
	 * @since 3.0
	 */
	protected void aboutToBeReconciled() {
		JavaCompositeReconcilingStrategy strategy= (JavaCompositeReconcilingStrategy) getReconcilingStrategy(IDocument.DEFAULT_CONTENT_TYPE);
		strategy.aboutToBeReconciled();
	}
	
	/*
	 * @see org.eclipse.jface.text.reconciler.AbstractReconciler#reconcilerReset()
	 */
	protected void reconcilerReset() {
		super.reconcilerReset();
        JavaCompositeReconcilingStrategy strategy= (JavaCompositeReconcilingStrategy) getReconcilingStrategy(IDocument.DEFAULT_CONTENT_TYPE);
		strategy.notifyListeners(true);
	}
	
	/*
	 * @see org.eclipse.jface.text.reconciler.MonoReconciler#initialProcess()
	 */
	protected void initialProcess() {
		 
		synchronized (fMutex) {
			super.initialProcess();
		}
		fIninitalProcessDone= true;
	}
	
	/*