[JDeepD]

Prime the author caches in wp_ajax_query_attachments() to reduce the number of database queries in the query-attachments admin-ajax endpoint.

Previously each distinct attachment author was loaded individually by wp_prepare_attachment_for_js(), costing two queries per author.

Trac ticket: https://core.trac.wordpress.org/ticket/66363

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Tool(s): Claude Code
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Used for: Use for initial finding on the issue. The code change is tested and reviewed by me.

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