@Override
  public void registerLineExtensionPainter(@NotNull IntFunction<? extends @NotNull Collection<? extends LineExtensionInfo>> lineExtensionPainter) {
    myLineExtensionPainters.add(lineExtensionPainter);
  }
@Override
  public void registerLineExtensionPainter(@NotNull IntFunction<? extends @NotNull Collection<? extends LineExtensionInfo>> lineExtensionPainter)