ArrayIndexOutOfBoundsException when turning folding on and off

[wilkinsona]

/*
 * Copyright 2012-2021 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
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package org.springframework.boot.docs.productionreadyfeatures.metrics.mongo;

// tag::code[]
import com.mongodb.event.CommandEvent;
import io.micrometer.core.instrument.Tag;
import io.micrometer.core.instrument.binder.mongodb.MongoMetricsCommandTagsProvider;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

// @fold:on
@Configuration(proxyBeanMethods = false)
public class SampleCommandTagsProviderConfiguration {

	// @fold:off
	@Bean
	MongoMetricsCommandTagsProvider customCommandTagsProvider() {
		return new CustomCommandTagsProvider();
	}
	// @fold:on

}

// @fold:off
// end::code[]
class CustomCommandTagsProvider implements MongoMetricsCommandTagsProvider {

	@Override
	public Iterable<Tag> commandTags(CommandEvent commandEvent) {
		return java.util.Collections.emptyList();
	}

}

Caused by: java.lang.ArrayIndexOutOfBoundsException: 20
	at io.spring.asciidoctor.backend.codetools.FoldListingContentConverter$FoldBlocks.createFoldArea(io/spring/asciidoctor/backend/codetools/FoldListingContentConverter.java:279)
	at io.spring.asciidoctor.backend.codetools.FoldListingContentConverter$FoldBlocks.get(io/spring/asciidoctor/backend/codetools/FoldListingContentConverter.java:274)
	at io.spring.asciidoctor.backend.codetools.FoldListingContentConverter$FoldBlocks.get(io/spring/asciidoctor/backend/codetools/FoldListingContentConverter.java:251)
	at io.spring.asciidoctor.backend.codetools.FoldListingContentConverter.convert(io/spring/asciidoctor/backend/codetools/FoldListingContentConverter.java:48)
	at io.spring.asciidoctor.backend.codetools.ListingContentConverters.content(io/spring/asciidoctor/backend/codetools/ListingContentConverters.java:55)