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T194037: Track dependencies for multiple Content objects per page, T194038: Introduce ContentHandler::getSecondaryDataUpdates to replace Content::getSecondaryDataUpdates, T194042: Replace usages of WikiPage::prepareContentForEdit, T194043: Replace usages of Content::getSecondaryDataUpdates, T194046: Introduce SlotRoleHandler and SlotRoleRegistry for declaring slot roles., T194048: Introduce RevisionRenderer (baseline), T194049: Introduce SlotRenderingProvider, T194263: Deprecate/Remove ContentHandler::makeParserOptions(), T194412: Make undo fail gracefully for non-main slots., T194429: Remove the need to generate ParserOutput before PageContentSave hook is called, T194729: Allow Wikibase Entities to be stored in alternative slots [MCR], T194730: Ensure that Wikibase data access to MediaInfo on file description pages works with MCR, T194731: Show diffs for all slots [MCR], T194734: Implement edit conflict resolution for MCR, T194736: Implement automatic conflict resolution for all slots [MCR], T194750: Deploy Structured Data on Commons baseline, T194830: Refactor DifferenceEngine, T195069: Factor PageStore and PageRecord out of WikiPage, T195212: ServiceContainer: Allow extensions to manipulate services upon creation, T195692: Attempt to undelete page causes error: Fatal exception of type IncompleteRevisionException: user_text field must not be !, T195779: MCR support in ORES, T195980: Write a specification for the architecture for handling slots, T196082: npm install for selenium tests not working on labs-vagrant, T196087: Refactored implementation of MCR page update interface, T196172: Test schema migration script, T196585: Deploy some MCR related patches on test / group0 for an extended period, T196653: Test MCR Storage Layer Patches, T197619: Introduce SCHEMA_COMPAT_XXX constants to allow more fine grained control over the migration process, T197685: Clarify semantics of "base revision" and "parent revision" in EditPage, WikiPage, and PageUpdater, T197816: Enable MCR migration stage "write both, read old" on live systems, T197817: Enable MCR migration stage "write both, read old" on testwiki, T197818: Enable MCR migration stage "write both, read old" on commons beta., T198024: [[MediaWiki:Undo-main-slot-only]] translation issue, T198075: RFC: factoring page update logic out of WikiPage, T198099: Improve MCR handling of RevisionAccessException family, T198297: Use PageUpdater to create dummy revisions, T198308: Enable MCR migration stage "write both, read new" on live systems, T198309: Enable MCR migration stage "write both, read new" on testwiki, T198311: Enable MCR migration stage "write both, read new" on commons beta., T198312: Set the WMF cluster to use the new MCR-only schema, T198341: Remove all references to the rev_text_id and ar_text_id fields, T198342: Remove all usages of the 'text' flag in calls to Revision::getQueryInfo() and RevisionStore::getQueryInfo()., T198343: Replace all calls to Revision::getRevisionText(), T198413: Allow multiple slots to be used while still writing to the old as well as the new schema, T198449: Rollback from autopatrolled user was marked as not patrolled, T198492: Create a maintenance script to drop rev_text_id and ar_text_id from the database., T198557: Remove the ability to write pre-MCR fields, limit the ability to read pre-MCR fields to migration scripts, T198558: Set testwiki to use the new MCR-only schema, T198559: Set Beta Cluster wikis to use the new MCR-only schema, T198561: Make "write both, read new" the default MCR migration stage for fresh MediaWiki installs / for CI
