From e671b7739a36ac30debbd47ca6a48b93f5f6fe77 Mon Sep 17 00:00:00 2001
From: umsangdon <umsangdon@gmail.com>
Date: Fri, 16 Oct 2026 21:37:29 +0900
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- 사진첩 되살림 표시(pageReplaying) — 되살림 중 바뀐 노선은 새 조작 아님
- 묶음 follow 가 그 차례엔 계획고 편집을 옮기지 않고 세션 노선 0 칸(사진) 그대로 · 관 · 구조물도 세션 그대로
- 바뀐 구간 첫 계획선 맞춤 · 계획고 옮김은 새 조작 때만
- 시험 test_356_4 · helper_356_4(끌기 · ▲ · 다시 끌기 · 중심점 보정 · 되돌리기 · 다시하기 · 옛 동작 대조) · test_349_0q 입력 만들기 함수로 뗌

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TteK8mfYZetk5P3bEZkyVZ
---
 A00_Common/design/design_pipeline_page.ts     |   8 +
 B05_Profile/B05_Profile_UI_Profile_History.ts |   8 +-
 resources/tester/helper_356_4_undo_grade.cjs  | 448 ++++++++++++++++++
 resources/tester/test_349_0q_undo_echo.py     |  10 +-
 resources/tester/test_356_4_undo_grade.py     |  88 ++++
 5 files changed, 558 insertions(+), 4 deletions(-)
 create mode 100644 resources/tester/helper_356_4_undo_grade.cjs
 create mode 100644 resources/tester/test_356_4_undo_grade.py

diff --git a/A00_Common/design/design_pipeline_page.ts b/A00_Common/design/design_pipeline_page.ts
index 48413bc6c..3ec3d51f0 100644
--- a/A00_Common/design/design_pipeline_page.ts
+++ b/A00_Common/design/design_pipeline_page.ts
@@ -55,6 +55,7 @@ import {
   readAlignmentDraft,
 } from "../../B05_Profile/B05_Profile_UI_Profile_Edit";
 import { readAlignment } from "../../B05_Profile/logic/B05_Profile_UI_Profile_Data";
+import { pageReplaying } from "../../B05_Profile/B05_Profile_UI_Profile_History";
 import {
   analysisTerrain,
   fetchRoutePlan,
@@ -259,6 +260,9 @@ function createPagePipeline(
   /** 묶음이 가게에 마지막으로 쓴 관 · 구조물 · 쓰는 동안(메아리 — 다시 입력으로 안 받음). */
   let written: Facilities | null = null;
   let echo = false;
+  /** 되돌리기 · 다시하기로 바뀐 노선(356-4) — follow 가 계획고 편집을 옮기지 않고 그 걸음 사진(세션 노선 0 칸)
+   *  그대로. 바뀐 구간 첫 계획선 맞춤 · 계획고 옮김은 새 조작 때만. */
+  let replay = false;
 
   const savedLine = (): Vertex[] | null =>
     plan ? plan.planned.map(([x, y]): Vertex => [x, y]) : null;
@@ -320,6 +324,9 @@ function createPagePipeline(
         savedLine: () => plan && { line: savedLine()!, curves: savedCurves() },
       }),
       follow: (ctx) => {
+        const kept = replay && ctx.inputs.route ? readAlignmentDraft(DRAFT_ROUTE_ID) : null;
+        replay = false;
+        if (kept) return { alignment: kept }; // 관 · 구조물도 세션 그대로(가게 · 쓰기 그대로)
         const line = ctx.before.route?.line ?? savedLine() ?? [];
         const { pipes, structures } = ctx.inputs;
         const inputs = {
@@ -567,6 +574,7 @@ function createPagePipeline(
         if (stored && same({ ...stored, rev: 0 }, { ...draft, rev: 0 })) draft = stored;
       }
       if (draft && !wasDraft && !held) held = holdNow();
+      replay = pageReplaying();
       store.set("routeDraft", draft);
       if (!started) return start();
       const before = pipe.output("route")?.line ?? null;
diff --git a/B05_Profile/B05_Profile_UI_Profile_History.ts b/B05_Profile/B05_Profile_UI_Profile_History.ts
index 932521a9d..d7c21b5f7 100644
--- a/B05_Profile/B05_Profile_UI_Profile_History.ts
+++ b/B05_Profile/B05_Profile_UI_Profile_History.ts
@@ -89,6 +89,10 @@ export function setPageHistory(history: ProfileHistory): void {
   active = history;
 }
 
+/** 되돌리기 · 다시하기가 세션을 되쓰고 화면을 되살리는 중인가 — 그 사이 바뀐 노선은 새 조작이 아님(356-4). */
+let replaying = false;
+export const pageReplaying = (): boolean => replaying;
+
 export type PageHistoryEvent = "undo" | "redo";
 interface PageHistoryHooks {
   /** 세션을 되쓴 뒤 — 자기 화면 값을 다시 읽음(사진첩이 막고 있는 동안이라 쌓이지 않음). */
@@ -193,7 +197,7 @@ export function createProfileHistory(onRestore: () => void, limit = 100): Profil
     if (index < 0 || index >= stack.length) return false;
     const kind: PageHistoryEvent = index < cursor ? "undo" : "redo";
     cursor = index;
-    restoring = true;
+    restoring = replaying = true;
     restoreSnapshot(stack[cursor]);
     try {
       onRestore();
@@ -201,7 +205,7 @@ export function createProfileHistory(onRestore: () => void, limit = 100): Profil
       // 되살리며 다시 쓴 같은 값(정리된 꼴)을 이 걸음으로 — 다음 찍기가 헛걸음을 안 만듦.
       stack[cursor] = takeSnapshot(stack[cursor]);
     } finally {
-      restoring = false;
+      restoring = replaying = false;
     }
     changed();
     return true;
diff --git a/resources/tester/helper_356_4_undo_grade.cjs b/resources/tester/helper_356_4_undo_grade.cjs
new file mode 100644
index 000000000..c72761132
--- /dev/null
+++ b/resources/tester/helper_356_4_undo_grade.cjs
@@ -0,0 +1,448 @@
+/* PLAN 356-4 sub7 헬퍼 — 되돌리기 · 다시하기는 그 걸음 사진(노선 + 계획고 편집)을 그대로 되살림.
+ * 판 = `helper_349_0q_undo_echo.cjs` 그대로(진짜 종단도 · 묶음 · 상세 가게 · 페이지 사진첩 · 서버 창구만 가짜).
+ * 편집기 흉내 = 사진첩 되살림 훅 안에서 세션 노선 초안을 다리에 넘김(`_RouteEdit_Draft` fromPage 꼴).
+ * 걸음 — 끌기 → 계획고 ▲(측점 C) → 다시 끌기(C 가 바뀐 구간 = 새 조작은 ▲ 버림) → 되돌리기 · 다시하기 →
+ * 중심점 좌우 꼴(끌기 + C 높이 보정 · 한 걸음) → 되돌리기 · 다시하기 → 열기까지 되돌리기.
+ * argv[4] = "off" 면 되살림 표시를 끔(옛 동작 대조). 결과 = 표준출력 JSON. 짝 = `test_356_4_undo_grade.py`. */
+const fs = require("fs");
+const path = require("path");
+const ts = require(path.join(__dirname, "..", "..", "config", "node_modules", "typescript"));
+const CATALOG = require("./helper_322_catalog_module.cjs");
+
+const ROOT = path.join(__dirname, "..", "..");
+const job = JSON.parse(fs.readFileSync(process.argv[2], "utf8"));
+
+function memoryStorage() {
+  const map = new Map();
+  return {
+    getItem: (key) => (map.has(key) ? map.get(key) : null),
+    setItem: (key, value) => map.set(key, String(value)),
+    removeItem: (key) => map.delete(key),
+    key: (index) => [...map.keys()][index] ?? null,
+    get length() {
+      return map.size;
+    },
+  };
+}
+const winListeners = {};
+const windowBase = {
+  sessionStorage: memoryStorage(),
+  localStorage: memoryStorage(),
+  setTimeout,
+  clearTimeout,
+  addEventListener: (type, fn) => (winListeners[type] ??= []).push(fn),
+  removeEventListener: () => undefined,
+};
+globalThis.window = new Proxy(windowBase, {
+  get: (t, key) => (key in t ? t[key] : undefined),
+  set: (t, key, value) => ((t[key] = value), true),
+});
+
+// 흙 배분 서버 — 늦게 답함 · 끊기면 버림
+globalThis.fetch = (url, init) =>
+  new Promise((resolve, reject) => {
+    const timer = setTimeout(
+      () => resolve({ ok: true, json: async () => ({ haul_plan: { blocks: [], url } }) }),
+      20,
+    );
+    init.signal.addEventListener("abort", () => {
+      clearTimeout(timer);
+      reject(new Error("aborted"));
+    });
+  });
+
+const STUBS = {};
+const cache = new Map();
+function loadTs(full) {
+  if (cache.has(full)) return cache.get(full);
+  const js = ts.transpileModule(fs.readFileSync(full, "utf8"), {
+    compilerOptions: { module: ts.ModuleKind.CommonJS, target: ts.ScriptTarget.ES2020 },
+  }).outputText;
+  const box = { exports: {} };
+  cache.set(full, box.exports);
+  const localRequire = (request) => {
+    if (CATALOG.isCatalogRequest(request)) return CATALOG;
+    const key = Object.keys(STUBS).find((name) => request.endsWith(name));
+    if (key) return STUBS[key];
+    if (request.startsWith("@config/")) return { API_BASE_URL: "http://fake" };
+    if (request.startsWith("@ui/")) return anyModule();
+    if (request.endsWith(".css")) return {};
+    if (request.endsWith(".json")) return require(path.join(path.dirname(full), request));
+    if (request.startsWith("@util/"))
+      return loadTs(path.join(ROOT, "common_util", `${request.slice(6)}.ts`));
+    if (request.startsWith(".")) return loadTs(path.join(path.dirname(full), `${request}.ts`));
+    return require(request);
+  };
+  new Function("exports", "module", "require", js)(box.exports, box, localRequire);
+  return box.exports;
+}
+const load = (...parts) => loadTs(path.join(ROOT, ...parts));
+
+const sampler = load("common_util", "common_util_surface_sampler.ts");
+const bytes = fs.readFileSync(process.argv[3]);
+const grid = sampler.parseDtmGrid(
+  bytes.buffer.slice(bytes.byteOffset, bytes.byteOffset + bytes.length),
+);
+const local = { grid, design: "las" };
+
+/** 아무 화면 부품 — 무엇을 읽든 · 부르든 또 그것(DOM · 오버레이 · 도구줄 흉내). */
+function anyNode() {
+  const box = { dataset: {}, style: {}, classList: { add() {}, remove() {}, toggle() {} } };
+  return new Proxy(function node() {}, {
+    get: (_t, key) => {
+      if (key in box) return box[key];
+      if (key === "then" || typeof key === "symbol") return undefined;
+      return (box[key] = anyNode());
+    },
+    set: (_t, key, value) => ((box[key] = value), true),
+    apply: () => anyNode(),
+  });
+}
+const anyModule = (own = {}) =>
+  new Proxy(own, {
+    get: (t, key) =>
+      key in t
+        ? t[key]
+        : key === "__esModule"
+          ? true
+          : typeof key === "symbol"
+            ? undefined
+            : anyNode(),
+  });
+globalThis.document = anyNode();
+globalThis.HTMLElement = function HTMLElement() {};
+
+STUBS["B05_Profile_Api_Replan"] = {
+  analysisTerrain: () => "las",
+  fetchRoutePlan: async () => ({
+    planned: job.line,
+    curves: job.curves,
+    min_radius_m: job.minRadius,
+    station_snap: job.stationSnap,
+  }),
+};
+STUBS["B05_Profile_Api_Structures"] = anyModule({
+  fetchStructures: async () => ({ structures: job.structures }),
+  fetchStructureTypes: async () => job.types,
+  readPendingStructures: () => null,
+});
+STUBS["B05_Profile_Api_TerrainGrid"] = {
+  loadDesignTerrainGrid: async () => local,
+  groundStageDeps: () => ({ grid: () => local, remote: async () => [] }),
+};
+STUBS["B04_PreProcess_Api_Fetch"] = {
+  fetchDetailPipePoints: async () => ({
+    pipe_points: job.pipes.map((pipe) => ({ ...pipe, lonlat: [0, 0] })),
+  }),
+};
+STUBS["B06_Section_UI_Standard_Panel"] = {
+  effectiveStandardCross: () => job.standard,
+  readRockBoundaryDefault: () => -0.5,
+};
+// 구조물 초안 얹기(측점 계획 · 형상) — 이 시험 밖 · 아무 일 없음
+STUBS["B06_Section_Section_Drafts"] = {
+  withDraftStations: async () => undefined,
+  withDraftShapes: async () => undefined,
+  forgetDraftStations: () => undefined,
+};
+STUBS["B06_Section_Api_Fetch"] = {
+  fetchSectionDetail: async () => JSON.parse(JSON.stringify(job.detail)),
+  saveSections: async () => undefined,
+};
+// 횡단 다시 셈(브라우저 · B05 crossPreview · B06 카드 같은 창구) — 부른 횟수 · 면적은 서버와 달라짐(두 배)
+let refreshCalls = 0;
+const doubled = (detail) =>
+  detail.cross_sections.forEach((section) => {
+    if (!section.design) return;
+    const design = { ...section.design };
+    for (const [key, value] of Object.entries(design))
+      if (key.endsWith("_m2") && typeof value === "number") design[key] = value * 2;
+    section.design = design;
+  });
+STUBS["B06_Section_Cross_Refresh"] = {
+  refreshCrossDesigns: async ({ detail }) => {
+    refreshCalls += 1;
+    doubled(detail);
+    return detail.cross_sections.map((s) => s.chainage_m);
+  },
+  // 화면 선 맡김 · 낡음 판정 = 진짜 `staleAgainstScreen` 그대로(화면 선 → 없으면 상세 자기 선)
+  holdScreenAlignment: (line) => {
+    screenLine = line;
+    return () => undefined;
+  },
+  staleAgainstScreen: (detail, routeId) => {
+    const screen = screenLine?.(routeId);
+    if (!screen) return common.hasStaleDesigns(detail);
+    return common.hasStaleDesigns({
+      longitudinal: {
+        design_profiles: [
+          profileData.toDesignProfile(screen, detail.longitudinal.design_profiles?.[0]),
+        ],
+      },
+      cross_sections: detail.cross_sections,
+    });
+  },
+  USER_TOUCHED_KEYS: [],
+};
+let screenLine = null;
+STUBS["B06_Section_UI_Cross_Detail"] = anyModule();
+STUBS["B06_Section_UI_Page_Common"] = anyModule({ L: (key) => key });
+// 그리기 — 진짜 `renderProfile` 의 낡음 판정 줄만(같은 함수 · 같은 인자) · SVG 는 안 그림
+const draws = [];
+let opened = null;
+STUBS["B05_Profile_UI_Profile_Render"] = {
+  renderProfile: (ctx) => {
+    const detail = ctx.detail();
+    if (!detail) return;
+    const alignment = ctx.alignment();
+    const longitudinal = detail.longitudinal;
+    const designProfiles = alignment
+      ? [profileData.toDesignProfile(alignment, longitudinal.design_profiles?.[0])]
+      : (longitudinal.design_profiles ?? []);
+    const key = common.staleKey({
+      longitudinal: { design_profiles: designProfiles },
+      cross_sections: detail.cross_sections,
+    });
+    // 저장 상세를 그림 = 묶음 새 노선 상세(preview)가 아님 · 그린 객체(가게 것인지 견줌)
+    draws.push({ key, saved: !detail.cross_sections.some((s) => s.preview), ref: detail });
+    ctx.onStaleDesigns?.(key);
+  },
+};
+STUBS["B05_Profile_UI_Profile_Tools"] = anyModule();
+STUBS["design_profile_free_view"] = anyModule();
+STUBS["B06_Section_UI_Cross_Panel_Base"] = anyModule();
+globalThis.sessionStorage = window.sessionStorage;
+STUBS["common_util_view_window"] = { frameOf: (_root, fn) => fn() };
+for (const name of [
+  "B05_Profile_UI_Profile_Balance",
+  "B05_Profile_UI_Profile_Heights",
+  "B05_Profile_UI_Profile_Zoom",
+  "B05_Profile_UI_Profile_Drag",
+  "B05_Profile_UI_Profile_MassHaul",
+  "design_profile_overlays",
+  "design_profile_viewport",
+  "design_save",
+  "B05_Profile_Api_Fetch",
+  "common_util_mass_haul_balance_view",
+])
+  STUBS[name] = anyModule();
+
+const pageMod = load("A00_Common", "design", "design_pipeline_page.ts");
+const storeMod = load("A00_Common", "design", "design_store.ts");
+const sectionStore = load("B06_Section", "B06_Section_Section_Store.ts");
+const common = load("B06_Section", "B06_Section_UI_Section_Common.ts");
+const layouts = load("B06_Section", "B06_Section_Structure_Layouts.ts");
+const profileData = load("B05_Profile", "logic", "B05_Profile_UI_Profile_Data.ts");
+const alignmentMod = load("B05_Profile", "logic", "B05_Profile_UI_Profile_Alignment.ts");
+const baseMod = load("A00_Common", "design", "design_profile_base.ts");
+const pageState = load("A00_Common", "b_page_state.ts");
+const massHaul = load("common_util", "common_util_mass_haul.ts");
+const historyMod = load("B05_Profile", "B05_Profile_UI_Profile_History.ts");
+const shiftMod = load("B05_Profile", "logic", "B05_Profile_RouteShift.ts");
+const profileMod = load("A00_Common", "design", "design_profile.ts");
+const designSync = load("B06_Section", "B06_Section_UI_Page_Design_Sync.ts");
+const designSession = load("B06_Section", "B06_Section_Cross_Design_Session.ts");
+const stationKeys = load("B06_Section", "B06_Section_Station_Keys.ts");
+// 진짜 다시 셈 창구(묶음 새 노선 상세를 안 고치는지만 봄 · 다른 곳은 위 가짜를 부름)
+const realRefresh = loadTs(path.join(ROOT, "B06_Section", "B06_Section_Cross_Refresh.ts"));
+
+const tick = (ms = 0) => new Promise((resolve) => setTimeout(resolve, ms));
+const runs = () => globalThis.__aisloPipeline?.runs ?? [];
+/** 묶음 · 상세 가게 · 다시 셈이 조용해질 때까지. */
+async function quiet() {
+  let seen = -1;
+  for (let i = 0; i < 400; i += 1) {
+    await tick(30);
+    const last = runs()[runs().length - 1];
+    const count = runs().length + refreshCalls * 1000 + draws.length * 1e6;
+    if (count === seen && (!last || last.outcome !== "running")) return;
+    seen = count;
+  }
+  throw new Error("묶음이 조용해지지 않음");
+}
+const n = job.nodes.length;
+const draftOf = (nodes) => ({
+  nodes,
+  curveOn: Array(n).fill(true),
+  curveRadius: Array(n).fill(null),
+  curveLock: Array(n).fill(null),
+  curveArc: Array(n).fill(null),
+  stationSnap: job.stationSnap,
+});
+const shift = (index, dx, dy) =>
+  job.nodes.map((node, i) => (i === index ? [node[0] + dx, node[1] + dy] : node));
+const sliceRuns = (mark) =>
+  runs()
+    .slice(mark)
+    .map((r) => ({
+      sources: r.sources,
+      outcome: r.outcome,
+      restored: r.restored ?? null,
+      why: r.restoreWhy ?? null,
+    }));
+const finalOf = (detail) => {
+  const [series] = massHaul.computeMassHaulSeries(
+    detail.longitudinal,
+    detail.cross_sections,
+    job.conversion,
+    undefined,
+    ["cross"],
+  );
+  const points = series?.result.points ?? [];
+  return points.length ? points[points.length - 1].cumulative_volume_m3 : null;
+};
+const crossOf = (detail) =>
+  JSON.stringify(detail.cross_sections.map((s) => [s.chainage_m, s.design, s.samples]));
+/** 서버 정본 흉내 — 저장 횡단 계획고 = 열 때 종단도 계획선(낡음 0 · 서버가 낸 상세와 같음). */
+function settleDesigns(detail) {
+  const pa = detail.longitudinal.profile_alignment;
+  const base = baseMod.listedBase(alignmentMod.toAlignmentBase(pa), detail, []);
+  const samples = alignmentMod.buildAlignment(base, pa.edits).samples;
+  const at = (c) => {
+    const i = samples.findIndex((s) => s.chainage_m >= c);
+    if (i < 0) return samples[samples.length - 1].elevation_m;
+    if (i === 0) return samples[0].elevation_m;
+    const a = samples[i - 1];
+    const b = samples[i];
+    return (
+      a.elevation_m +
+      ((b.elevation_m - a.elevation_m) * (c - a.chainage_m)) / (b.chainage_m - a.chainage_m)
+    );
+  };
+  detail.cross_sections.forEach((s) => (s.design.design_elevation_m = at(s.chainage_m)));
+}
+
+async function run() {
+  const P = "proj-3564";
+  const R = 7;
+  window.localStorage.setItem("frd_current_project_id", P);
+  opened = await sectionStore.loadSectionDetail(P, R);
+  settleDesigns(opened);
+  stationKeys.useStationKeys(P, R, opened);
+  const profile = profileMod.createDesignProfile({
+    projectId: P,
+    view: "profile",
+    onSelectStation: () => undefined,
+  });
+  pageMod.routeDraftBridge(P, profile, {
+    stationIntervalM: job.interval,
+    structureAreas: ({ cross_sections: rows }) =>
+      layouts.applyStructureAreaRows(rows, layouts.structureAreaRows(rows)),
+    holdDraft: (routeId, saved) => {
+      const hold = saved && sectionStore.holdSectionDetail(P, routeId, saved);
+      return async (stations) => {
+        if (!hold) {
+          await sectionStore.swapSectionStations(P, routeId, stations);
+          return "no-saved";
+        }
+        const back = await sectionStore.restoreSectionDetail(P, routeId, hold, stations);
+        return !back ? "no-cache" : back.same ? "saved" : "saved-diff";
+      };
+    },
+  });
+  const show = (detail) => {
+    profile.render(detail, job.interval, R);
+    profile.setIrregularStations([]);
+  };
+  const stopListen = sectionStore.subscribeSectionDetail(P, R, (next) => show(next));
+  const stopStore = storeMod.useDesignStore(P, null).subscribe("stations", (stations) => {
+    if (stations?.length) void sectionStore.swapSectionStations(P, R, stations);
+  });
+  show(opened);
+  profile.setEarthworkContext({ conversion: job.conversion });
+  await quiet();
+
+  if (process.argv[4] === "off") historyMod.pageReplaying = () => false; // 옛 동작 대조
+  const bridge = pageMod.routeDraftBridge(P, profile);
+  const designStore = storeMod.useDesignStore(P, null);
+  // 편집기 흉내 — 되살림 훅 안에서 세션 노선 초안을 다리에 넘김(노선 편집기가 사진첩에 단 훅 꼴)
+  historyMod.onPageHistory({
+    restore: () => {
+      const kept = designStore.get("routeDraft");
+      bridge.edited(kept ? draftOf(kept.nodes) : null);
+    },
+  });
+  const album = () => historyMod.pageHistory();
+  const pipe = () => pageMod.pagePipeline(P);
+  const gesture = () => (winListeners.keydown ?? []).forEach((fn) => fn({}));
+  /** 한 걸음 — 손길 · 사진첩 멈춤 · 조작 · 조용해짐 · 한 번 쌓음. */
+  const step = async (fn) => {
+    gesture();
+    album().pause();
+    await fn();
+    await quiet();
+    album().resume();
+  };
+  const grade = async (edits) => {
+    pageMod.pipelineGrade(P, edits);
+    await quiet();
+  };
+  const stations = pipe().output("ground").stations;
+  const [nx, ny] = job.nodes[1];
+  const C = stations.reduce((a, b) =>
+    Math.hypot(b.x - nx, b.y - ny) < Math.hypot(a.x - nx, a.y - ny) ? b : a,
+  ).chainageM;
+  const state = () => ({
+    route: designStore.get("routeDraft")?.nodes[1] ?? null,
+    z: alignmentMod.planElevationAt(pipe().output("profile"), C),
+    offs: JSON.stringify(pipe().input("alignment")?.station_offsets ?? {}),
+    session: window.sessionStorage.getItem(`aislo:draft:alignment-draft:${P}:0`),
+  });
+  const out = { C, open: state() };
+  await step(() => bridge.edited(draftOf(shift(1, 6, -4))));
+  out.drag1 = state();
+  await step(() => {
+    const p = pipe();
+    return grade(alignmentMod.adjustStation(p.output("planline"), p.input("alignment"), C, 0.3));
+  });
+  out.lift = state();
+  await step(() => bridge.edited(draftOf(shift(1, 9, -6))));
+  out.drag2 = state();
+  album().undo();
+  await quiet();
+  out.undo1 = state();
+  album().redo();
+  await quiet();
+  out.redo1 = state();
+  // 중심점 좌우 꼴 — 끌기 + C 계획고를 끌기 전 값으로(한 걸음)
+  const zBefore = state().z;
+  await step(async () => {
+    bridge.edited(draftOf(shift(1, 12, -8)));
+    await quiet();
+    const p = pipe();
+    const pinned = shiftMod.pinStationHeight(
+      p.output("planline"),
+      p.input("alignment"),
+      C,
+      zBefore,
+    );
+    if (pinned) await grade(pinned);
+  });
+  out.pinned = { ...state(), zBefore };
+  album().undo();
+  await quiet();
+  out.undo2 = state();
+  album().redo();
+  await quiet();
+  out.redo2 = state();
+  for (let i = 0; i < 6 && album().canUndo(); i += 1) {
+    album().undo();
+    await quiet();
+  }
+  out.home = state();
+  out.blocked = pipe().blockedWrites;
+  stopListen();
+  stopStore();
+  pageMod.disposePagePipeline(P);
+  return out;
+}
+
+run()
+  .then((out) => {
+    process.stdout.write(JSON.stringify(out));
+    process.exit(0);
+  })
+  .catch((error) => {
+    process.stderr.write(String(error && error.stack ? error.stack : error));
+    process.exit(1);
+  });
diff --git a/resources/tester/test_349_0q_undo_echo.py b/resources/tester/test_349_0q_undo_echo.py
index 455486817..fad9cb771 100644
--- a/resources/tester/test_349_0q_undo_echo.py
+++ b/resources/tester/test_349_0q_undo_echo.py
@@ -60,8 +60,8 @@ def _between(sections: list[dict], index: int) -> dict:
     }
 
 
-@pytest.fixture(scope="module")
-def r() -> dict:
+def build_job() -> dict:
+    """입력 한 벌 — 356-4 시험도 빌림."""
     if not (GRID.is_file() and (SECTION / "longitudinal/longitudinal.json").is_file()):
         pytest.skip("검증_sub7 없음")
     curves = _json(ROUTE / "planned_route_curves.json")
@@ -120,6 +120,12 @@ def r() -> dict:
             "cross_sections": sections,
         },
     }
+    return job
+
+
+@pytest.fixture(scope="module")
+def r() -> dict:
+    job = build_job()
     with tempfile.TemporaryDirectory() as folder:
         path = Path(folder) / "job.json"
         path.write_text(json.dumps(job), encoding="utf-8")
diff --git a/resources/tester/test_356_4_undo_grade.py b/resources/tester/test_356_4_undo_grade.py
new file mode 100644
index 000000000..5e1d65f18
--- /dev/null
+++ b/resources/tester/test_356_4_undo_grade.py
@@ -0,0 +1,88 @@
+"""PLAN 356-4 sub7 — 되돌리기 · 다시하기 = 그 걸음 사진(노선 + 계획고 편집) 그대로.
+
+· 노선 바뀜 규칙(바뀐 구간 첫 계획선 맞춤 · 계획고 옮김)은 새 조작 때만 — 되살림 때는 안 탐
+· 끌기 → 계획고 ▲(측점 C) → 다시 끌기(새 조작 = ▲ 버림) → 되돌리기 = ▲ 그대로 · 다시하기 = 다시 끌기 값
+· 중심점 좌우 꼴(끌기 + C 높이 보정 한 걸음) → 되돌리기 = 조작 전 계획고 · 편집 · 다시하기 = 보정 값
+· 고침을 끈 판(옛 동작)은 되돌리기에서 ▲ · 보정이 사라짐 — 시험이 흠을 실제로 잡음
+짝: `helper_356_4_undo_grade.cjs`(판 = 349-0q · 실제 TS 를 Node 로 · 화면 부품 · 서버 창구만 가짜).
+"""
+
+from __future__ import annotations
+
+import json
+import subprocess
+import tempfile
+from pathlib import Path
+
+import pytest
+
+import test_349_0q_undo_echo as base
+
+HERE = Path(__file__).resolve().parent
+
+
+def _run(job: dict, mode: str) -> dict:
+    with tempfile.TemporaryDirectory() as folder:
+        path = Path(folder) / "job.json"
+        path.write_text(json.dumps(job), encoding="utf-8")
+        grid = Path(folder) / "grid.bin"
+        grid.write_bytes(base.dtm_grid_bytes(base.GRID))
+        proc = subprocess.run(  # noqa: S603 — 고정 실행 파일
+            ["node", str(HERE / "helper_356_4_undo_grade.cjs"), str(path), str(grid), mode],
+            capture_output=True,
+            text=True,
+            encoding="utf-8",
+            timeout=300,
+        )
+    assert proc.returncode == 0, proc.stderr
+    return json.loads(proc.stdout)
+
+
+@pytest.fixture(scope="module")
+def job() -> dict:
+    return base.build_job()  # 349-0q 판 입력(검증_sub7)
+
+
+@pytest.fixture(scope="module")
+def r(job) -> dict:
+    return _run(job, "on")
+
+
+@pytest.fixture(scope="module")
+def off(job) -> dict:
+    return _run(job, "off")
+
+
+def test_새_조작은_바뀐_구간_계획고_편집을_버림(r):
+    c = f"{r['C']:.3f}"
+    assert c in json.loads(r["lift"]["offs"])  # ▲ 가 C 에
+    assert c not in json.loads(r["drag2"]["offs"])  # 다시 끌기(새 조작) = 버림
+    assert r["drag2"]["route"] != r["lift"]["route"]
+
+
+def test_되돌리기_다시하기_그_걸음_사진(r):
+    assert r["undo1"]["route"] == r["lift"]["route"]
+    assert r["undo1"]["offs"] == r["lift"]["offs"]  # ▲ 그대로
+    assert r["undo1"]["z"] == pytest.approx(r["lift"]["z"], abs=1e-4)
+    assert r["redo1"]["route"] == r["drag2"]["route"]
+    assert r["redo1"]["offs"] == r["drag2"]["offs"]
+    assert r["redo1"]["z"] == pytest.approx(r["drag2"]["z"], abs=1e-4)
+
+
+def test_중심점_좌우_보정_되돌리기(r):
+    pinned = r["pinned"]
+    assert pinned["z"] == pytest.approx(pinned["zBefore"], abs=1e-3)  # 높이 보정
+    assert pinned["offs"] != r["redo1"]["offs"]
+    assert r["undo2"]["route"] == r["redo1"]["route"]
+    assert r["undo2"]["offs"] == r["redo1"]["offs"]  # 조작 전 편집
+    assert r["undo2"]["z"] == pytest.approx(pinned["zBefore"], abs=1e-4)  # 조작 전 계획고
+    assert r["redo2"]["route"] == pinned["route"]
+    assert r["redo2"]["offs"] == pinned["offs"]  # 보정 값
+    assert r["home"]["route"] is None and r["home"]["offs"] == r["open"]["offs"]
+    assert r["blocked"] == 0
+
+
+def test_옛_동작은_되돌리기에서_편집이_사라짐(off):
+    c = f"{off['C']:.3f}"
+    assert c not in json.loads(off["undo1"]["offs"])  # ▲ 사라짐(고친 흠)
+    assert off["redo2"]["offs"] != off["pinned"]["offs"]  # 다시하기에서 보정 사라짐