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

Draft

adamsilverstein wants to merge 9 commits into

WordPress:trunkfrom

adamsilverstein:backport/77584-jxl-lazy-load

Commits on Mar 20, 2026

Media: Allow HEIC/HEIF uploads when server lacks support
adamsilverstein
committed

Commits on Apr 22, 2026

Merge remote-tracking branch 'origin/trunk' into add/heic-canvas-fallback
adamsilverstein
committed

Commits on May 28, 2026

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