Tab support incorrectly copies callouts from other blocks

[sbrannen]

Overview

As mentioned in spring-projects/spring-framework#29505 and spring-projects/spring-framework@ac7d428, tabs incorrectly include callouts from other blocks within a section of the generated documentation if some blocks use callouts and others do not.

Related Issues

• Code example has callout from a different code example spring-projects/spring-framework#29505

[sbrannen]

As a side note, I have discovered two workarounds for this.

1. Include callouts for every pair of primary/secondary blocks within the same section of the documentation (which is what I did in spring-projects/spring-framework@ac7d428).
2. Enclose any pair of primary/secondary blocks that do not use callouts in a double-underscore block, like below.

--
[source,java,indent=0,subs="verbatim,quotes",role="primary"]
.Java
----
	@PutMapping("/accounts/{account}")
	public String save(@ModelAttribute("account") Account account) {
		// ...
	}
----

[source,kotlin,indent=0,subs="verbatim,quotes",role="secondary"]
.Kotlin
----
	@PutMapping("/accounts/{account}")
	fun save(@ModelAttribute("account") account: Account): String {
		// ...
	}
----
--

[sbrannen]

That was a very quick turnaround. Thanks, @wilkinsona! 👍