Rejecting an inserted paragraph (or accepting a deleted one) whose mark carries a section break
left it empty; remove_empty_para refused it for the break, so the next paragraph was joined into
it and took its properties (style, numbering, indents). The empty paragraph now goes whole and
its section joins the following one first, as deleting the break does (remove_section_break).
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Martin Ball <martin.ball@ucscaregroup.co.uk>