Implement multi-content revisions
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Technical Epic for MCR
See also the mcr wiki.

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Status	Assigned	Task
Declined	dchen	T118706 Conduct heuristic evaluation of image upload and insert flow in VisualEditor
Open	None	T115858 Design improvements for mw.ForeignStructuredUpload.BookletLayout
Open	None	T115865 Insert image in content immediately after it's uploaded, skipping the "General settings" step
Duplicate	None	T115864 Figure out if the description of the image can be used as the caption on-wiki
Open	None	T53032 When inserting an image, set its caption by default to be the Commons image description
Resolved	Abit	T122381 Provide a way to curate and fetch titles (short descriptions) for media files
Open	None	T12863 Links on commons upload summaries do not link to commons
Open	None	T5498 Image history is confusing
Open	None	T96384 Integrate file revisions with description page history
Open	None	T39534 Wikimedia Commons should support searching by color
Duplicate	None	T39535 Wikimedia Commons should support filtering by color
Open	None	T19503 Provide metadata support on Wikimedia Commons
Open	None	T122038 Moving/Deleting a video file does not move/delete subtitles files, nor does it inform the file mover of their existence
Open	None	T135221 Make TimedText content an integral part of the File page
Open	None	T2167 Use a dedicated interface for adding meta-data like interwiki links, rather than wikitext
Open	None	T132072 Integrate page meta-data as a new content model revision slot for consistency and atomicity
Resolved	ppelberg	T54448 Transclusion dialog should not suggest documentation sub pages as templates
Resolved	Krinkle	T52512 TemplateData: Page properties should not be stored twice (both Template and Template/doc)
Open	None	T56140 Move TemplateData to its own JSON-content namespace and associate with Template-namespace, or to its own TemplateData content model and revision slot
Open	None	T51662 VisualEditor: Use Multimedia/Wikidata's proposed rich structured meta-data in the image insertion dialog
Open	None	T68108 [Epic] Store media information for files on Wikimedia Commons as structured data
Open	None	T174043 Deploy Multi-Content Revisions
Open	None	T203157 Make the spam whitelist its own slot
Open	None	T174022 Implement multi-content revisions
Resolved	brion	T107595 [RFC] Multi-Content Revisions
Resolved	daniel	T141877 Update Multi-Content-Revision design document, and move it to mw.org
Resolved	daniel	T141878 Build a straw-man DB schema for Multi-Content-Revisions
Resolved	daniel	T174023 Implement MCR storage layer
Resolved	daniel	T194015 Make PageArchive aware of MCR
Resolved	daniel	T194034 Make rollback inherit all slots from the target version
Resolved	daniel	T198413 Allow multiple slots to be used while still writing to the old as well as the new schema
Open	None	T189220 Ensure that relevant extensions are MCR-aware
Open	None	T195779 MCR support in ORES
Resolved	awight	T201332 ORES feature extraction triggers new MCR-related deprecation warning
Open	None	T191795 Support MCR in mobile
Open	None	T200687 MCR support in TemplateStyles
Open	None	T187935 Allow cross-slot access during HTML rendering.
Open	None	T201848 Make DifferenceEngine callers pass revisions, not contents
Open	None	T202763 Update extensions which customize content diff rendering
Open	None	T117279 [EPIC] Core should provide inline diffs as well as side by side (Move InlineDifferenceEngine into core / remove MobileDiff)
Resolved	ovasileva	T101796 MobileDiff appears strangely empty if previous revision is hidden
Open	None	T222562 Special:MobileDiff doesn't correctly handle diff=0 if the diff would cover multiple revisions
Resolved	Edtadros	T224430 Improve appearance of Special:MobileDiff when looking for invalid revision (Maybe because it's deleted)
Open	None	T194830 Refactor DifferenceEngine
Open	None	T238331 Option for hiding changes should be added on phone
Resolved	daniel	T208767 Ensure that SpamBlacklist applies to the content of all MCR slots
Resolved	Jdforrester-WMF	T208769 Ensure that AbuseFilter applies to the content of all MCR slots
Resolved	daniel	T209291 Make AbuseFilter::revisionToString work across slots
Resolved	Jdforrester-WMF	T208770 Ensure TitleBlacklist applies when the context is an MCR page
Resolved	Jdforrester-WMF	T208771 Ensure ConfirmEdit applies when the context is an MCR page
Open	None	T218096 Extension Duplicator needs to be updated due to MCR schema changes
Duplicate	None	T189809 Allow the diff action to show multiple slots [MCR]
Open	None	T190066 Expose all slots to the search interface
Open	None	T185793 Revision hash needs to consider content model and slot role
Open	None	T174037 Implement single-slot UI [MCR]
Open	None	T204112 Support slots other than the main slot in EditPage
Open	None	T208801 Support slots other than the main slot in EditPage - backend support
Open	None	T208802 Support slots other than the main slot in EditPage - UI support
Open	None	T229615 Add support for live preview feature on multi-content revision edit
Open	None	T209923 Surface hidden and "undefined" slots via a single slot view
Open	None	T209878 Allow control of page layout of multiple slots during rendering
Open	None	T200915 Allow SlotRoleHandlers to control page layout
Open	None	T205444 Provide a way of having a meaningful slot header
Open	None	T209924 Specify PageTypeHandler
Open	daniel	T205459 Decide how SlotRoleHandlers can provide placeholders for missing slots
Resolved	daniel	T194046 Introduce SlotRoleHandler and SlotRoleRegistry for declaring slot roles.
Resolved	daniel	T195980 Write a specification for the architecture for handling slots
Open	CCicalese_WMF	T211726 Collect requirements for slot based layout
Open	None	T209044 Introduce a ContentStore service to allow certain types of content to not be stored as serialized blobs.
Open	daniel	T196087 Refactored implementation of MCR page update interface
Resolved	daniel	T174038 Initial implementation of MCR page update interface
Invalid	daniel	T174039 Implement MCR page update legacy version
Duplicate	None	T174026 Implement MCR content meta-data storage service
Resolved	Anomie	T174030 Implement DB schema migration tools for MCR
Resolved	Anomie	T182678 [MCR] Script for populating empty ar_rev_id fields
Resolved	Anomie	T182682 [MCR] Script(s) for populating new tables (slots, content, content_models, slot_roles)
Resolved	Addshore	T180989 Improve Test Coverage for WikiPage class
Resolved	daniel	T174024 Implement MCR revision retrieval interface
Resolved	Anomie	T166732 Refactor comment storage in the database and abstract access in MediaWiki
Resolved	None	T166798 Decide whether back-compat views for upcoming major schema changes will be provided in the Labs replicas
Duplicate	None	T232531 Refactor Comment fields for CheckUser Component
Stalled	None	T233004 Schema changes for `cu_changes` and `cu_log` table
Resolved	daniel	T174028 Finalize database schema for MCR content meta-data
Resolved	Addshore	T188518 Implement Storage service for content models and slot roles
Resolved	daniel	T189004 replace slot_inherited with slot_origin
Resolved	Marostegui	T190153 DROP unused 'slots' table (WAS: In the slots table, replace slot_inherited with slot_origin)
Resolved	Addshore	T188741 MCR Scheme change - Make rev_text_id DEFAULT 0
Resolved	Marostegui	T190148 Change DEFAULT 0 for rev_text_id on production DBs
Resolved	Tgr	T187586 Installer fails in RevisionStore
Duplicate	None	T192459 Allow SearchUpdate to process multiple slots
Resolved	Addshore	T180210 Improve test coverage for Revision class
Resolved	daniel	T197685 Clarify semantics of "base revision" and "parent revision" in EditPage, WikiPage, and PageUpdater
Open	None	T192307 Provide MCR-aware hook points
Open	None	T205982 MCR: replace PageContentSave hook: must have a hook that receives all slots (for edit-intercepting extensions like Moderation)
Open	None	T194042 Replace usages of WikiPage::prepareContentForEdit
Resolved	daniel	T194037 Track dependencies for multiple Content objects per page
Resolved	daniel	T194038 Introduce ContentHandler::getSecondaryDataUpdates to replace Content::getSecondaryDataUpdates
Resolved	daniel	T190063 Tracking dependencies for multiple Content objects per page (MCR)
Resolved	Tgr	T194043 Replace usages of Content::getSecondaryDataUpdates
Resolved	Tgr	T196653 Test MCR Storage Layer Patches
Resolved	Tgr	T192306 Create MCR test wiki on WM Cloud
Resolved	Bstorm	T194239 Request creation of mcr-dev VPS project
Resolved	CCicalese_WMF	T196082 npm install for selenium tests not working on labs-vagrant
Open	None	T195069 Factor PageStore and PageRecord out of WikiPage
Open	Vedmaka	T208776 Introduce PageIdentity to be used instead of Title
Open	None	T198075 RFC: factoring page update logic out of WikiPage
Open	Anomie	T174032 Make relevant API modules aware of MCR
Resolved	daniel	T174025 Implement MCR revision retrieval legacy version
Open	daniel	T198099 Improve MCR handling of RevisionAccessException family
Resolved	Anomie	T200568 Make API query modules aware of MCR
Resolved	Anomie	T200569 Make ApiComparePages API module aware of MCR
Open	Anomie	T200570 Make ApiEditPage and ApiStashEdit API modules aware of MCR
Open	None	T174033 Refactor EditPage to allow multiple slots to be edited atomically [MCR]
Open	None	T194734 Implement edit conflict resolution for MCR
Open	daniel	T194736 Implement automatic conflict resolution for all slots [MCR]
Open	None	T209927 Decide how to control which slots are offered for editing per default
Open	Anomie	T200572 Make ApiParse API module aware of MCR
Resolved	daniel	T174035 Allow the view action to show multiple slots [MCR]
Resolved	daniel	T194048 Introduce RevisionRenderer (baseline)
Invalid	Tgr	T194049 Introduce SlotRenderingProvider
Resolved	Anomie	T194263 Deprecate/Remove ContentHandler::makeParserOptions()
Resolved	Anomie	T190712 Wikibase\Repo\Content\EntityHandler should not override makeParserOptions()
Open	None	T206253 Some ApiParse requests fail due to fatal MWException: "not supported for content model"
Open	None	T198297 Use PageUpdater to create dummy revisions
Open	None	T189808 Make undo work with multiple slots.
Resolved	daniel	T194412 Make undo fail gracefully for non-main slots.
Duplicate	None	T194413 Make action=undo work properly with multiple slots (phase 2)
Resolved	Anomie	T205101 McrUndoAction preview doesn't work
Resolved	Anomie	T200216 Make undo work with SDC by showing a UI to confirm undo without allowing an edit
Resolved	Tgr	T194731 Show diffs for all slots [MCR]
Resolved	Tgr	T201842 Use ContentHandler to obtain DifferenceEngine in MobileFrontend
Open	None	T198492 Create a maintenance script to drop rev_text_id and ar_text_id from the database.
Open	None	T198557 Remove the ability to write pre-MCR fields, limit the ability to read pre-MCR fields to migration scripts
Resolved	daniel	T198706 Make BackupDumper, WikiExporter and XmlDumpWriter compliant with the MCR revision retrival mechanism (main slot only)
Resolved	BPirkle	T203424 Replace the WikiExporter backup dump streaming mode with batched queries