`nim doc` broken for fusion/htmlparser/parsexml (breaks if both a/b.nim vs a.nim)

[timotheecour]

Example

https://nim-lang.github.io/fusion/parsexml.html gives a 404

https://nim-lang.github.io/fusion/theindex.html shows

Modules: parsexml, src/fusion/astdsl, src/fusion/btreetables, src/fusion/docutils, src/fusion/filepermissions, src/fusion/htmlparser, src/fusion/htmlparser/xmltree, src/fusion/ioutils, src/fusion/matching, src/fusion/pointers, src/fusion/pools, src/fusion/scripting, src/fusion/smartptrs.

which shows parsexml is weirdly the odd one out (and clicking it yields a 404)

Note: after investigation, it's caused by existence of these:

src/fusion/htmlparser.nim
src/fusion/htmlparser/parsexml.nim

more generally, when you have:

foo/bar.nim
foo.nim

this seems to cause issues

Additional Information

1.5.1 a013467
I can reproduce this locally off of nim-lang/fusion#64
but I can't reproduce this locally off of fusion master 31e69e88f28a160ad271d6ff0fc748d715ed24c4 if i run nimble docs for eg.

[juancarlospaco]

Should also test:

foo.nim/bar.nim
foo.nim

Because #16388 (comment) 🤔 ❓

[timotheecour]

foo.nim/bar.nim

if someone writes a dir named foo.nim, they're asking for trouble...