claude code agent 227 a766672574 fix(mcp): replaceImage no longer yanks the cursor (#164) ...

`mutateLiveContentUnlocked` — the write path used by `replaceImage` — still
did the pre-#152 destructive write (delete the whole fragment + applyUpdate a
fresh Y.Doc), discarding every Yjs node id. y-prosemirror anchors the editor
selection to those ids, so an open editor's cursor snapped to the document
end on every image swap, exactly the #152 jump that the main write path no
longer causes.

Switch it to the same `applyDocToFragment(ydoc, newDoc)` structural diff
(updateYFragment) as the main path, so unchanged nodes keep their ids and the
live cursor stays put. It runs its own atomic transact, so the old explicit
transact/delete is gone; the now-unused docmostExtensions import is dropped.

Regression tests (cursor-stability suite): a sibling paragraph's
RelativePosition survives a top-level image src/attachmentId swap, and an
image nested in a callout, matching the shapes replaceImage produces.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-06-25 11:36:01 +03:00

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