[Bug]: Cursor Origin single-line review threads lose their line anchor #35895

#!/bin/sh
set -u
repo=$(cd "$1" && pwd) || { echo 'RESULT: inconclusive'; exit 2; }
scratch=$(mktemp -d) || { echo 'RESULT: inconclusive'; exit 2; }
trap 'rm -rf "$scratch"' EXIT HUP INT TERM
export HOME="$scratch/home" TMPDIR="$scratch/tmp"
export XDG_CONFIG_HOME="$scratch/config" XDG_DATA_HOME="$scratch/data" XDG_STATE_HOME="$scratch/state" T3CODE_HOME="$scratch/t3"
export GIT_CONFIG_NOSYSTEM=1 GIT_CONFIG_GLOBAL=/dev/null
mkdir -p "$HOME" "$TMPDIR" "$XDG_CONFIG_HOME" "$XDG_DATA_HOME" "$XDG_STATE_HOME" "$T3CODE_HOME"
node --version
npm --version
if ! npm install --prefix "$scratch" --ignore-scripts --no-audit --no-fund --no-package-lock --save-exact effect@4.1.3 @effect/platform-node@4.1.2 >"$scratch/install.log" 2>&1; then
  cat "$scratch/install.log"
  echo 'RESULT: inconclusive'
  exit 2
fi
node -e 'for (const n of ["effect", "@effect/platform-node"]) console.log(n + " " + require(process.argv[1] + "/node_modules/" + n + "/package.json").version)' "$scratch"
cat >"$scratch/probe.mjs" <<'JS'
import { registerHooks, createRequire } from 'node:module';
import { readFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { pathToFileURL } from 'node:url';
const repo = resolve(process.argv[2]);
const runtime = import.meta.url;
registerHooks({ resolve(specifier, context, nextResolve) {
  if (specifier.startsWith('@t3tools/')) {
    const [name, ...rest] = specifier.slice('@t3tools/'.length).split('/');
    const folder = `${repo}/packages/${name}`;
    const manifest = JSON.parse(readFileSync(`${folder}/package.json`, 'utf8'));
    const key = rest.length ? `./${rest.join('/')}` : '.';
    const target = manifest.exports[key];
    return nextResolve(pathToFileURL(resolve(folder, typeof target === 'string' ? target : target.import)).href, context);
  }
  if (specifier === 'effect' || specifier.startsWith('effect/') || specifier.startsWith('@effect/')) return nextResolve(specifier, {...context, parentURL: runtime});
  return nextResolve(specifier, context);
}});
const Effect = await import('effect/Effect');
const Schema = await import('effect/Schema');
const { make } = await import(pathToFileURL(`${repo}/packages/source-control-cursor-origin/src/server/OriginPullRequestProvider.ts`).href);
const { OriginCli } = await import(pathToFileURL(`${repo}/packages/source-control-cursor-origin/src/server/OriginCli.ts`).href);
const now = '2026-01-01T00:00:00.000Z';
const comments = [
  {id:'fixture-single', thread:{id:'thread-single',path:'file.ts',side:'right',startLine:12,endLine:0},body:'single',createdAt:now},
  {id:'fixture-range', thread:{id:'thread-range',path:'file.ts',side:'right',startLine:12,endLine:14},body:'range',createdAt:now},
];
const cli = OriginCli.of({
 api: (input, schema) => Schema.decodeUnknownEffect(schema)(input.path.includes('/comments?') ? {comments} : input.path.includes('/reviews?') ? {reviews:[]} : input.path.includes('/commits?') ? {commits:[]} : {number:1,title:'Fixture',webUrl:'https://cursor.com/codebase/fixture/repo/pull/1',head:{ref:'feature',sha:'a'.repeat(40)},base:{ref:'main',sha:'b'.repeat(40)}}),
 execute: () => Effect.succeed('{}'), viewer: () => Effect.succeed('fixture'), personalNamespace:()=>Effect.succeed('fixture'),resolveRepository:()=>Effect.succeed('fixture/repo'),
});
await Effect.runPromise(Effect.scoped(Effect.gen(function*(){
 const provider = yield* make;
 const result = yield* provider.getChangeRequestActivity({cwd:process.cwd(),repository:'fixture/repo',number:1});
 const single = result.reviewThreads.find(x => x.id === 'thread-single');
 const range = result.reviewThreads.find(x => x.id === 'thread-range');
 console.log(`range control: expected 14, actual ${range?.line}`);
 console.log(`single-line anchor: expected 12, actual ${single?.line}`);
 if (range?.line !== 14 || !single) { console.log('RESULT: inconclusive'); process.exitCode = 2; }
 else if (single.line === 12) { console.log('RESULT: expected behavior'); process.exitCode = 0; }
 else { console.log('RESULT: defect reproduced'); process.exitCode = 1; }
}).pipe(Effect.provideService(OriginCli, cli))));
JS
node "$scratch/probe.mjs" "$repo"
status=$?
if [ "$status" -ne 0 ] && [ "$status" -ne 1 ]; then
  echo 'RESULT: inconclusive'
  exit 2
fi
exit "$status"