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## Problem
Desktop Smoke E2E flaked on `mentions.spec.ts` ("typing a mention before
existing text does not interleave spaces"): picking a suggestion
mid-draft and typing immediately could swallow the draft's own space,
producing `hello @bob abcworld` instead of `hello @bob a world`.
With `hello world` drafted and ` @bo` typed after `hello`, picking the
suggestion leaves `hello @bob world` — the mention's trailing space
followed by the draft's space. Chromium reconciles that whitespace run
by re-emitting it as a replacement (`replace(" " -> " a")`), anchored at
*either* edge of the run. The settling-time text-input redirect only
recognized a caret or a rewrite anchored at the chip edge, so the other
shapes fell through to ProseMirror's destructive default and ate the
separator.
The race pre-dates this branch and reproduces on `main`.
## Fix
`mentionHighlightExtension.ts` now redirects on the invariant instead of
on a specific rewrite shape. While autocomplete is settling the user
cannot have a selection (a selection cancels settlement), so a
whitespace-only replacement adjacent to a mention's trailing space is
always the browser normalizing whitespace — never an intentional delete.
The handler keeps every space already in the document and inserts only
the typed characters after the token, whichever edge the rewrite is
anchored at. Non-whitespace replacements still fall through as real
edits.
`insertPosForMentionTextInput` / `mentionTextInputInsertPos` become
`insertionForMentionTextInput` / `mentionTextInputInsertion`, returning
`{insertAt, text}` so the handler can rewrite the payload, not just the
position.
## Tests
- Helper-level cases for all four anchors (caret at chip edge, caret
past the trailing space, run rewritten from the chip edge, draft space
rewritten alone), plus space/NBSP variants and a non-whitespace
replacement that must be left alone.
- A plugin-level test drives the real `handleTextInput` prop and falls
back to ProseMirror's default when it declines — exactly as the browser
does with the return value — so it fails against the previous production
code rather than depending on winning a timing race in a headless
browser.
Desktop unit suite passes on pre-push (5558/5558).
---------
Signed-off-by: Matt Toohey <contact@matttoohey.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>