private @NotNull Color getBackgroundIgnoreForced() {
    Color color = myScheme.getDefaultBackground();
    if (myDocument.isWritable()) {
      return color;
    }
    Color readOnlyColor = myScheme.getColor(EditorColors.READONLY_BACKGROUND_COLOR);
    return readOnlyColor != null ? readOnlyColor : color;
  }
private @NotNull Color getBackgroundIgnoreForced()