[diffs/edit] fix editor state persisting

[ije]

• add sharedEditor prop for EditProvider

  function EditorApp()  {
    const editor = useMemo(
      () => new Editor<undefined>({ persistState: true, onChange: handleChange }),
      [handleChange]
    );
    
    return (
      <EditProvider sharedEditor={editor}>
        <File file={activeFile} edit />
      </EditProvider>
    );
  }

• fix state persisting ignore scroll top position with persistState option set to true.

  Screen.Recording.2026-08-04.at.01.37.51.mov

• cache editor instances by editorOptions

• re-structure edit docs page

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid reusing cached documents for recreated diffs

When persistState is true for a FileDiff, this now derives a persisted cache key and allows #getCachedTextDocument to win for diffs as well as files. If a React surface recreates FileDiffMetadata from the original before/after after an edit (same cacheKey) instead of reusing the mutated metadata object, FileDiff.attachEditor has no __prepareFile-style rerender path, so the editor's TextDocument/API and the already-rendered diff DOM diverge and the next edit applies against hidden cached text. Restrict cached-document reuse to File or add a diff prepare/rerender path.

Useful? React with 👍 / 👎.

[ije]

fixed in 9b2aff5

[chatgpt-codex-connector]

Keep async restores from overriding user scroll

With async persistStateStorage (including indexedDB), a user can scroll the editor before get(cacheKey) resolves. Because the stale-restore guard compares scrollLeft but deliberately ignores the newly persisted scrollTop, the delayed restore can still call #setViewportScrollTop and yank the viewport back to the old stored position; please either include vertical scroll in the staleness signal after layout reconciliation or distinguish internal layout adjustments from user scrolls.

Useful? React with 👍 / 👎.

[ije]

Added user scroll detection during async state restoration in 6558158