@NotNull
  private CoverageEditorAnnotator getOrCreateAnnotator(Editor editor, PsiFile file, CoverageEngine engine) {
    synchronized (myAnnotationsLock) {
      return myAnnotators.computeIfAbsent(editor, (x) -> engine.createSrcFileAnnotator(file, editor));
    }
  }
@NotNull
  private CoverageEditorAnnotator getOrCreateAnnotator(Editor editor, PsiFile file, CoverageEngine engine)