Twenty Twenty: Fix font inconsistency in Latest Posts block editor.

[Gulamdastgir-Momin]

This PR was previously opened here, but since there was no further activity on it, I’ve created a new PR based on the latest trunk, including the changes mentioned in this comment

Trac ticket: https://core.trac.wordpress.org/ticket/63798

This PR fixes a font styling inconsistency in the Twenty Twenty theme where the Latest Posts block displays post content using different fonts in the editor and the frontend when “Full post” content is selected.

Testing

As outlined here

[github-actions]

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Props gulamdastgir04, sabernhardt.

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[github-actions]

Hi @Gulamdastgir-Momin! 👋

Thank you for your contribution to WordPress! 💖

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[github-actions]

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Test this pull request with WordPress Playground.

[sabernhardt]

Test Report

Description

This report validates that the indicated patch works as expected.

Patch tested: https://github.com/WordPress/wordpress-develop/pull/10468.diff

Environment

• WordPress: 6.9-beta4-61182-src
• PHP: 8.4.0
• Server: Apache/2.4.62 (Win64) PHP/8.4.0 mod_fcgid/2.3.10-dev
• Database: mysqli (Server: 9.1.0 / Client: mysqlnd 8.4.0)
• Browser: Firefox 144.0
• OS: Windows 11
• Theme: Twenty Twenty 2.9
• Plugins:
  • Test Reports 1.2.0

Actual Results

1. ✅ With the patch, paragraphs in the full post content of a Latest Posts block appear in the sans-serif font.

Supplemental Artifacts

Full screenshots in English:

• Front end, before patch
• Front end, with patch
• Post editor, before patch
• Post editor, with patch
• Widgets editor, before patch
• Widgets editor, with patch

Persian screenshots:

• Front end, with patch, RTL
• Post editor, with patch, RTL
• Widget editor, with patch, RTL