Fix: fix collapse selector

[Embers-of-the-Fire]

Summary

The initial selector uses element.nextSibling, which may select an empty #text on Chromium-based browsers.

Here is an instance:

For a link in the sidebar, it usually seems like this:

<li>
    <a href="link" title="foo">foo</a>
    <ul class="app-sub-sidebar">...</ul>
</li>

The collapsing function uses element.nextSibling to check if collapsing is needed. However, in Chromium-based browsers, a blank text tag will possibly be inserted, making the directory unable to collapse.

What kind of change does this PR introduce?

For any code change,

• [ ] Related documentation has been updated if needed
• [ ] Related tests have been updated or tests have been added

This is a small fix so there's no test related.

Does this PR introduce a breaking change? (check one)

• [ ] Yes
• [x] No

Tested in the following browsers:

• [x] Chrome
• [ ] Firefox
• [ ] Safari
• [x] Edge
• [ ] IE

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Name	Status	Preview	Comments	Updated (UTC)
docsify-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 3, 2023 3:49am

[Embers-of-the-Fire]

Eee, I don't know why the ci failed, as I've tested it locally and there's no error.

[trusktr]

Hello, thanks!

Eee, I don't know why the ci failed, as I've tested it locally and there's no error.

It didn't fail, I had to hit approve to make ci run.