Table of contents missing border between last parent header and all children

[tlindsay42]

Description

The table of contents does not display the border between the last parent header (<h2>) cell and all subsequent children (<h3>). This behavior occurs whether in standard or wide mode, for all skins tested, as well as for both pages & posts.

Environment

• Minimal Mistakes version:
• Ruby gem or remote theme version:
• Jekyll version:

Get-Content -Path .\Gemfile.lock | Select-String -Pattern '^\s{4}(?:jekyll(?:\s|-remote-theme)|minimal-mistakes-jekyll)'

    jekyll (3.7.3)
    jekyll-remote-theme (0.2.3)
    minimal-mistakes-jekyll (4.11.2)

• Git repository URL: https://github.com/troylindsay/troylindsay.github.io
• Operating system: Windows 10
• GitHub Pages hosted (if yes provide URL to site): https://www.troylindsay.io

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Expected behavior

The same border should be drawn between the last two cells as surrounds all of the other cells.

Steps to reproduce the behavior

Control 1

1. Create a page or post with a table of contents (example)
2. Enter a few test headers with the last header being a parent (<h2>)
3. Serve - the issue will not appear

Control 2

1. Set classes: 'wide' in the front matter
2. The issue will not appear

Test 1

1. Change the last header to a child (<h3>)
2. The border will be missing between the last parent and its child header in the table of contents

Test 2

1. Comment out classes: 'wide' in the front matter

Test 3

1. Add another child header (<h3>)

Test 4

1. Re-enable classes: 'wide' in the front matter

[mmistakes]

Looks like this CSS doesn't cover all possible combinations of nested list items.

I was using it to remove the last item's border so there wasn't a thicker one at the bottom, but I think it's safe to remove it all together. Then all list items correctly get a border-bottom.