publishToConfluence looses the id when generating level 2 page anchors

[srotman]

Describe the bug
When using the subpagesForSections=2 setting, Confluence will loose the links to level 3 adoc headers

To Reproduce
Steps to reproduce the behavior:

1. Set the concluence.with setting for subpagesForSections to 2
2. Include a level 3 heading on an included page (In my case a level 2 heading, but with leveloffset +1, using the https://docs.asciidoctor.org/pdf-converter/latest/interdocument-xrefs/#converting-interdocument-xrefs-to-internal-xrefs syntax)
3. The generated HTML page will render those as headers as h3 headings.
4. On publishing, the pageAnchor for these headings gets lost, and no link macro will be generated for these links, resulting in broken links on the published Confluence page.

Expected behavior
The pageAnchors are not lost, and the links on the published Confluence page work :-)

Configuration

• docToolchain 2.2.1, as well as docToolchain latest.
• OS: Windows
• JDK 11

Additional context
I created a minimal example containing this issue: https://github.com/srotman/docToolchain-1161

According to my analysis, the problem lies in the getPagesRecursive function:

docToolchain/scripts/asciidoc2confluence.groovy

Lines 944 to 958 in c9cc6f3

	def title = sect.select("h${level + 1}").text()
	Elements pageBody
	if (level == 1) {
	pageBody = sect.select('div.sectionbody')
	} else {
	pageBody = new Elements(sect)
	pageBody.select("h${level + 1}").remove()
	}
	def currentPage = [
	title: title,
	body: pageBody,
	children: [],
	parent: parentId
	]
	pageAnchors.putAll(recordPageAnchor(sect.select("h${level + 1}")))

It seems that the new Elements(...) constructor (line 949) does not perform a deep Copy, resulting in a removal of the h3 element on line 950. The subsequent select of that same element on line 958 now yields no results any longer.

If this line:

docToolchain/scripts/asciidoc2confluence.groovy

Line 958 in c9cc6f3

pageAnchors.putAll(recordPageAnchor(sect.select("h${level + 1}")))

is moved up to line 945 (right after the initial select) the pageAnchors are kept correctly, and the Confluence links will work as expected.

[srotman]

Would be fixed by #1162