enh/y indexeddb

[max-nextcloud]

• wip: try y-indexeddb
• chore(split) useIndexedDbProvider from Editor.vue
• fix(cron): do not reset document
• enh(yjs): store baseVersionEtag alongside doc
• Fixes: #7415

TODOs

• [x] Think through other file operations.
• [x] Typing without network, closing the editor, opening it again: no content lost
• [x] After closing and opening the editor, undo history is empty
• [ ] Add base_version_etag as custom property to IndexedDB
  • [x] After loading document from IndexedDB, send baseVersionEtag as part of create request
  • [x] In case of conflict, use existing manual conflict handling
  • [x] After manual conflict handling, reset y-indexeddb provider for document
  • [x] Fix endless reload loop when base version has been cleared:
    • Open file with version in indexed db but on a different baseVersionEtag.
    • Different versions are detected. Reload button is offered.
    • Reload does not change the indexed db content - so conflict persists.
  • [x] migrate change mime type test to playwright
  • [x] debug failing change mime type test.
  • [ ] make bc channel depend on base version etag.
  • [ ] Test... start editing offline, overwrite file in other tab, see what happens when getting back online @max-nextcloud
• [ ] Opening editor: steps from IndexedDB that didn't get sent to server yet need to get pushed
• [ ] Opening editor: when steps from IndexedDB didn't get sent to server yet, unsaved changes should be indicated and saved
• [x] cleanup yDoc file server-side when file is deleted @mejo-
• [ ] cleanup client side state for deleted files
• [ ] config flag

[codecov[bot]]

Codecov Report

:x: Patch coverage is 52.83019% with 25 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/services/WebSocketPolyfill.ts	30.76%	9 Missing :warning:
src/services/SyncService.ts	12.50%	6 Missing and 1 partial :warning:
src/helpers/yjs.ts	0.00%	3 Missing and 1 partial :warning:
src/composables/useConnection.ts	71.42%	1 Missing and 1 partial :warning:
src/helpers/updateFromContent.ts	85.71%	2 Missing :warning:
src/EditorFactory.ts	85.71%	1 Missing :warning:

:loudspeaker: Thoughts on this report? Let us know!

[mejo-]

• [x] cleanup yDoc file server-side when file is deleted @mejo-

Turns out this already happens and we don't have to change anything: https://github.com/nextcloud/text/blob/ce8ca645ab64cbf5c0de56fe214bb04d4dfee25b/lib/Listeners/BeforeNodeDeletedListener.php#L42