The issue seems to be that $pageHasThumbnails = count( $out->getFileSearchOptions() ) > 0; is always false. Parsoid needs to call ContentMetadataCollector::addImage when parsing.
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Event Timeline
Change 1005628 had a related patch set uploaded (by Arlolra; author: Arlolra):
[mediawiki/services/parsoid@master] [WIP] Call ContentMetadataCollector::addImage
Change 1005627 had a related patch set uploaded (by Arlolra; author: Arlolra):
[mediawiki/core@master] Return additional info about files in DataAccess
Change 1005627 merged by jenkins-bot:
[mediawiki/core@master] Return additional info about files in DataAccess
Change 1005836 had a related patch set uploaded (by Arlolra; author: Arlolra):
[mediawiki/core@master] Support "showmedia" parsertests option
Change 1005837 had a related patch set uploaded (by Arlolra; author: Arlolra):
[mediawiki/services/parsoid@master] Support "showmedia" parsertests option
Change 1005628 merged by jenkins-bot:
[mediawiki/services/parsoid@master] Populate image metadata info in parser output
Change 1006201 had a related patch set uploaded (by Sbailey; author: Sbailey):
[mediawiki/vendor@master] Bump wikimedia/parsoid to 0.19.0-a19
Change 1006201 merged by jenkins-bot:
[mediawiki/vendor@master] Bump wikimedia/parsoid to 0.19.0-a19
Post-deploy to group0 today, MultimediaViewer is opening on officewiki pages. It sometimes requires a purge.
Change 1005836 merged by jenkins-bot:
[mediawiki/core@master] Support "showmedia" parsertests option
Change 1005837 merged by jenkins-bot:
[mediawiki/services/parsoid@master] Support "showmedia" parsertests option
Change 1008400 had a related patch set uploaded (by Isabelle Hurbain-Palatin; author: Isabelle Hurbain-Palatin):
[mediawiki/vendor@master] Bump wikimedia/parsoid to 0.19.0-a20
Change 1008400 merged by jenkins-bot:
[mediawiki/vendor@master] Bump wikimedia/parsoid to 0.19.0-a20