Editor: PHP backports for Client Side Media#10868

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adamsilverstein wants to merge 49 commits intoWordPress:trunkfrom

adamsilverstein:backport-preload-changes-for-csm-70

Commits on Feb 20, 2026

add preload patchs for client side media
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REST API: Add media processing settings to index endpoint
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REST API: Add filename and filesize fields to attachments
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REST API: Add exif_orientation field to attachments
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REST API: Add generate_sub_sizes and convert_format params
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REST API: Add sideload endpoint for attachments
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REST API: Improve missing_image_sizes for PDFs
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Media: Add cross-origin isolation support
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Media: Add WASM MIME type to .htaccess rules
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Media: Add crossorigin attributes to media templates
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Tests: Update REST API tests for client-side media fields

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Docs: Update @since tags from 6.9.0 to 7.0.0

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Update src/wp-includes/media.php

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Update src/wp-includes/media.php

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Update src/wp-includes/media.php

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Update src/wp-includes/rest-api/class-wp-rest-server.php

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Use WP_HTML_Tag_Processor in wp_override_media_templates
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Fix EXIF orientation 0 treated as valid value
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Update REST API QUnit fixtures for Client Side Media changes

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Add wp_client_side_media_processing_enabled filter
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Apply suggestions from Weston

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Use static closure in sideload_item
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update gutenberg ref
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Fix fatal error from early function call in default-filters
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update GB ref, take 2
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update gb ref
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Add client-side media processing JS flag to core
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update gb ref
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Fix method signature compatibility with parent WP_REST_Controller.

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update gb ref
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Fix client-side media processing build issues in copy-gutenberg-build.js

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Update src/wp-includes/media.php

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Update src/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php

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Update src/wp-includes/media.php

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Fix image_sizes format in REST API index for CSM
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Check IMG srcset for cross-origin URLs
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Clean up CSM filters on all error paths
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Apply suggestions from code review from Weston and Mukesh

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Use shorter path in doc block
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Refactor cross-origin check to be data-driven
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Add imagesrcset and poster to cross-origin checks
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Remove wp_filter_mod_rewrite_rules_for_wasm
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Add crossorigin check and docs to wp_override_media_templates

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Remove unused params from filter_wp_unique_filename

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Merge branch 'trunk' into backport-preload-changes-for-csm-70
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Move crossorigin processing into wp_print_media_templates
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Fix PHPCS array declaration spacing errors
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regenerate wp-api fixtures
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Fix wp-api-generated.js fixture to match CI environment

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