Headings located inside quotations, groups or list items generate badly nested sections

When parsing markdown/1.2 content, a heading located inside a container block (quotation, group created from a <div>, list item, etc.) opens a section that is only closed at the end of the document (or by the next heading), i.e. after the container has been closed. The generated events are thus not well nested and the resulting XDOM is wrong (the content following the container ends up in the section).

Steps to reproduce

Parse:

> # Title

after

Result

beginSection
beginQuotation
beginHeader [1, HTitle]
...
endQuotation
beginParagraph
onWord [after]
endParagraph
endSection

The same happens with a heading inside a <div> group or a list item.

Expected

Sections opened inside a container are closed when the container ends, as with the XWiki 2.1 syntax.