Media: Add JPEG XL (JXL) upload support with companion-original preservation (backport GB #77584)#12006

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adamsilverstein:backport/77584-jxl-lazy-load

Commits on Mar 20, 2026

Media: Allow HEIC/HEIF uploads when server lacks support
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Commits on Apr 22, 2026

Merge remote-tracking branch 'origin/trunk' into add/heic-canvas-fallback
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Commits on May 28, 2026

Merge remote-tracking branch 'origin/trunk' into add/heic-canvas-fallback
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REST API: Add HEIC client-side support to the sideload route.
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Media: Delete HEIC companion file when its attachment is deleted.
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Tests: Cover the HEIC client-side sideload and companion-delete flow.
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Tests: Use HEIC fixture and convert_format=false for original-heic sideload.
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Tests: Refresh wp-api-generated.js fixture for the sideload route.
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Media: Add JPEG XL (JXL) upload support with companion-original preservation.
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Commits on Jun 18, 2026

Tests: Regenerate REST API client fixture for the original-jxl sub-size.
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