final @Nullable EditorColorsScheme getBaseScheme() {
    if (schemeName.startsWith(Scheme.EDITABLE_COPY_PREFIX)) {
      EditorColorsScheme original = getOriginal();
      if (original != null) {
        return original;
      }
    }
    return parentScheme;
  }
final @Nullable EditorColorsScheme getBaseScheme()