Query loop block with full width and having a template of image, title, and date has a full-width issue on the editor side in the Twenty Twenty theme.

Overview

This pull request addresses alignment inconsistencies between the block editor and frontend view in the Twenty Twenty theme, ensuring blocks render identically in both environments.

Trac Ticket: 56153

Issues Fixed

1. Query Loop Featured Image Full-Width Mismatch

• Problem: When a Query Loop block is set to full width with a Featured Image template, the image doesn't stretch edge-to-edge in the editor, despite doing so on the frontend
• Solution: Added CSS rules to ensure Featured Images span the full editor canvas width

2. Post Content Alignment in Query Loop Templates

• Problem: Within full-width Query Loop templates, Post Title, Post Date, and Post Excerpt appear centered in the editor but render left-aligned on the frontend
• Solution: Updated alignment handling to honor full-width settings consistently across both views

3. Default Title Block Alignment Inconsistency

• Problem: Standalone Title blocks (without explicit alignment) display centered in the editor but left-aligned on the frontend
• Solution: Modified CSS to ensure default Title blocks are left-aligned in both editor and frontend

Changes Made

• Improved alignment consistency for Post Title, Post Date, and Post Excerpt blocks
• Fixed default Title block positioning to match between editor and frontend views

Testing Instructions

Test Case 1: Full-Width Featured Image in Query Loop

1. Create a new post/page in the block editor and set template to full-width (post meta)
2. Add a Query Loop block with a template containing:
   • Post Featured Image
   • Post Title
   • Post Date
   • Post Excerpt
3. Set Query Loop alignment to Full Width
4. Set Post Template alignment to Full Width
5. Set Post Featured Image alignment to Full Width

Expected Results:

• Editor: Featured image stretches edge-to-edge with no visible margins, and the post title, date, and excerpt are left aligned.
• Frontend: Featured image spans edge-to-edge and post title, date, and excerpt are left aligned, matching the editor exactly.

Test Case 2: Template-Level Full-Width Settings

1. Create a new post/page
2. Add a Query Loop block with the Post Featured Image template and set post meta template to full-width
3. Set Query Loop alignment to Full Width
4. Leave Post Featured Image at default alignment (no explicit setting)

Expected Results:

• Editor: Featured image automatically stretches full width due to parent template settings
• Frontend: Featured image renders edge-to-edge, identical to editor view

Test Case 3: Default Title Block Alignment

1. Create a new post/page
2. Insert a Title block with no alignment selection (leave as default)
3. Observe positioning in the editor
4. Publish/preview and check the frontend

Expected Results:

• Editor: Title block appears left-aligned (not centered)
• Frontend: Title block is left-aligned
• Both views show identical positioning