Fix: Correct nested list markers in Latest Posts and Post Content

[dpmehta]

What?

Closes #63604

Fixes an issue where unordered lists nested inside the Latest Posts block and the Post Content block displayed the incorrect sequence of list item markers.

Why?

Browsers natively track list nesting to sequence markers (disc -> circle -> square). However, because blocks like Latest Posts and Post Template use <ul> or <li> wrappers for their outer structure, any List Block placed inside them is interpreted by the browser as an already nested list, immediately applying circle to the first level.

A previous fix attempted this by explicitly applying list-style-type to all <li> elements within these block wrappers. But selecting the <li> also overrode the inherited styles and defaults of ordered lists (<ol>), which meant that user-selected list styles like upper-roman or lower-alpha didn't work.

How?

The CSS rules for .wp-block-latest-posts__post-full-content and .wp-block-post-content have been updated to target ul > li rather than just li or ul.

By strictly targeting list items that are direct children of unordered lists (ul > li), we explicitly reset the marker sequence ( as mentioned above ) for unordered lists and forcefully override the browser's User Agent styles. Importantly, this syntax completely ignores <ol> list items. Ordered lists will now correctly preserve their browser defaults (decimal) or user-defined inline styles.

Testing Instructions

1. Create a new post.
2. Add a list block. Example:

<!-- wp:list -->
<ul class="wp-block-list"><!-- wp:list-item -->
<li>One: disc<!-- wp:list -->
<ul class="wp-block-list"><!-- wp:list-item -->
<li>nested: circle<!-- wp:list -->
<ul class="wp-block-list"><!-- wp:list-item -->
<li>two levels: square<!-- wp:list -->
<ul class="wp-block-list"><!-- wp:list-item -->
<li>three levels: square</li>
<!-- /wp:list-item --></ul>
<!-- /wp:list --></li>
<!-- /wp:list-item --></ul>
<!-- /wp:list --></li>
<!-- /wp:list-item --></ul>
<!-- /wp:list --></li>
<!-- /wp:list-item --></ul>
<!-- /wp:list -->

3. Add a latest posts block.
4. Enable the post content option, and select "show full post".
5. Set the number of items to 1.
6. Verify: The first level of the unordered list should display a solid disc, the second level an open circle, and the third a square.
7. Verify: The ordered list should preserve its custom numbering sequence (e.g., I, II, III) and not be incorrectly forced to disc.

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Co-authored-by: dpmehta <mehtadev@git.wordpress.org>
Co-authored-by: Rishit30G <rishit30g@git.wordpress.org>
Co-authored-by: carolinan <poena@git.wordpress.org>

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