Wieland Lindenthal
d351296e6c
https://community.openproject.org/wp/STC-779 Three independent defects together caused Y.UndoManager state to be lost in the documents module: 1. `useCreateBlockNote(editorParams, [activeUser])` used `[activeUser]` as the recreation key. BlockNote's `useCreateBlockNote(options, deps)` uses `deps` as the sole `useMemo` key (options is intentionally NOT in deps). Since `block-note-element.ts` parses a fresh `activeUser` from the host attribute via `JSON.parse` on every `renderCallback` invocation, any path that re-rendered the React tree handed in a new object reference and rebuilt the editor (and its UndoManager). 2. `LiveCollaborationManager.initializeYjsProvider` was not idempotent. Stimulus's `init-yjs-provider` controller can fire `connect()` a second time without firing `disconnect()` (HMR replay, Turbo morph, parent re-attach). The duplicate call destroyed the live Y.Doc + provider and rebuilt both, remounting the editor and wiping its history. The controller now adopts the existing session via `getCurrentSessionFor(documentName)` instead of constructing a duplicate. 3. The `React.StrictMode` wrap in `block-note-element.ts` caused BlockNoteView to destroy and recreate the ProseMirror view between StrictMode's two dev-mode mounts. `y-prosemirror`'s `yUndoPlugin` destroys the `Y.UndoManager` on view-destroy (removing its `afterTransaction` handler from the Y.Doc), but the plugin state retains the now-dead UndoManager reference. After the second mount the editor reused the destroyed UndoManager, no handler was re-attached, no stack items were recorded, and Ctrl+Z was a no-op. StrictMode is dev-only and incompatible with the current y-prosemirror lifecycle, so it is removed from the BlockNote tree. Verified on release/17.5: typing produces stack items, Ctrl+Z reverts to the previous state, Ctrl+Shift+Z reapplies, and the Y.Doc has exactly one `afterTransaction` observer (the live UndoManager's). Synthetic duplicate `connect()` no longer remounts the editor. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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