RevisionDelete is "Change visibility of selected revisions". The scenarios/test areas only involve this if specifically stated.
Test areas
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* Straight deletion
* Straight undeletion
* [RevisionDelete] Revision deletion
* [RevisionDelete] Revision undeletion attempting to change the content model.
* Page recreation
* Attempting to undelete a Flow board on top of a non-Flow page (possibly due to recreation; see above)
* {T104591} (block EnableFlow in this case?)
Test plans
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* Create wikitext -> Delete wikitext page -> Enable Flow -> Delete Flow board -> Restore only wikitext revision with checkbox -> Restore Flow with checkbox
* Create as Flow -> Delete Flow -> Create as wikitext -> Delete wikitext -> Create as wikitext -> Undelete both together (since the top-level page after restoration is wikitext, you have to query flow_workflow on workflow_namespace and workflow_title_text to see if the workflow_page_id matches the restored page)
* After the one immediately above, delete all revisions, undelete Flow board.
* Create wikitext page -> delete wikitext page -> undelete deleted wikitext page -> deleted undeleted wikitext page again -> create new Flow page where wikitext page was ->undelete wikitext page where Flow page is now -> delete all revisions -> undelete wikitext.
* Create Flow page -> delete Flow page -> undelete deleted Flow page -> deleted undeleted Flow page again -> create new wikitext page where Flow page was ->undelete Flow page where wikitext page is now -> delete all revisions -> undelete Flow
* [RevisionDelete] Create wikitext page -> delete page -> create Flow board -> delete page -> hide Flow revision using RevisionDelete -> unhide Flow revision using RevisionDelete -> undelete Flow revision
* [RevisionDelete] Create Flow board -> delete page -> create wikitext page -> undelete Flow board -> hide Flow revision using RevisionDelete -> delete page -> undelete only Flow revision
** With "Remove restrictions on restored revisions" unchecked (should fail)
** With "Remove restrictions on restored revisions" checked (should work and show only Flow)
* Etc.
It's okay to reject some of these operations (e.g. revision deletion) as long as we end up in a consistent state.
See https://en.wikipedia.org/wiki/Wikipedia_talk:Flow/Archive_14#Can_we_please_get_rid_of_it_.28oh_wait.2C_I_already_did.29 .
After these scenarios are developed, they should be tested and issues fixed as part of {T122262}.