6384.md

```
% pandoc --wrap=preserve --file-scope command/file1.txt command/file2.txt
^D
<h1 id="command__file1.txt__zed">Zed</h1>
<p><a href="bar">foo</a>
and <a href="#command__file1.txt__zed">Zed</a>
and <a href="#command__file2.txt__zed">other Zed</a>
and <a href="#command__file2.txt">other file</a>
and <a href="c.md#zed">foreign Zed</a></p>
<h2 id="command__file2.txt__zed">Zed</h2>
<p><a href="baz">foo</a></p>
```