Created attachment 284066 [details]
minimal example that generates broken qhp

If you have a markdown main page file, with anchor #mainpage, which has the same title as the PROJECT_NAME, using sections or subpages on that main page will break the QHP file - one too many "</section>" closing tags is placed in the file, making it corrupt.

    <toc>
      <section title="My Project" ref="index.html">
        <section title="Table of Contents " ref="index.html#toc" />
        <section title="Sub-page" ref="mysubpage.html">
          <section title="Intro " ref="mysubpage.html#subintro" />
        </section>
      </section>
    </section>
  </toc>

The page itself is collapsed in the QHP toc (there's no duplicate reference to index.html, as discussed in #612854).

After changing the label of the main page to something that doesn't match the PROJECT_NAME setting (e.g. "My Project Mainpage"), the generated QHP file is correct:

    <toc>
      <section title="My Project" ref="index.html">
        <section title="My Project Mainpage" ref="index.html">
          <section title="Table of Contents " ref="index.html#toc" />
          <section title="Sub-page" ref="mysubpage.html">
            <section title="Intro " ref="mysubpage.html#subintro" />
          </section>
        </section>
      </section>
    </toc>

Note how the mainpage reference is now not collapsed into the main index.html reference; instead you have the duplicate reference (again, bug #612854 also mentions this).

If the main page has no sections (e.g. "\ref" instead of "\subpage", no headings with anchor definitions as "{#anchor}"), the output is also correct.

This might also be related to bug #558361.

*Steps to reproduce:*
1. Create a project with a markdown file as main page, set GENERATE_QHP = Yes, PROJECT_NAME to "My Project".
2. Make the first header the same as the PROJECT_NAME setting, add anchor definition {#mainpage} (i.e. "# My Project {#mainpage}"
3. Add a section to the main page (e.g. "# Introduction {#intro}") or use the "\subpage" command on the main page.
4. Generate the documentation

Attached is a minimal example to demonstrate the issue.