From 29779f0c5ead117d080ec18a2eb2d4c41aada4b1 Mon Sep 17 00:00:00 2001
From: Kai <kai.hartlage@n8n.io>
Date: Wed, 19 Aug 2026 07:46:44 +0000
Subject: [PATCH] feat(editor): Show diff for closed review requests (#36539)

---
 .../frontend/@n8n/i18n/src/locales/en.json    |  8 +-
 .../WorkflowReviewChangesSection.test.ts      | 82 ++++++++++++++++++-
 .../WorkflowReviewChangesSection.vue          | 76 ++++++++++++++---
 .../WorkflowReviewDetailTabs.test.ts          | 24 +++---
 .../components/WorkflowReviewDetailTabs.vue   | 29 ++++---
 .../views/WorkflowReviewRequestsView.test.ts  |  2 +-
 6 files changed, 181 insertions(+), 40 deletions(-)

diff --git a/packages/frontend/@n8n/i18n/src/locales/en.json b/packages/frontend/@n8n/i18n/src/locales/en.json
index 977421d42c9..962ad13956f 100644
--- a/packages/frontend/@n8n/i18n/src/locales/en.json
+++ b/packages/frontend/@n8n/i18n/src/locales/en.json
@@ -5561,14 +5561,18 @@
 	"workflowReviews.detail.metadata.reviewers": "Reviewers",
 	"workflowReviews.detail.metadata.noReviewers": "No reviewers assigned.",
 	"workflowReviews.detail.metadata.workflow": "Workflow",
-	"workflowReviews.changes.closed.body": "Changes aren't shown for closed reviews.",
-	"workflowReviews.changes.empty": "This review doesn't contain any workflows.",
+	"workflowReviews.changes.workflowUnavailable": "The workflow in this review is no longer available.",
 	"workflowReviews.changes.unavailable": "Couldn't load the changes for this review. Refresh to try again.",
 	"workflowReviews.changes.versionUnavailable.body": "The submitted workflow version is no longer available.",
+	"workflowReviews.changes.closedWithoutApproval": "This review was closed without approval, so there are no changes to compare.",
 	"workflowReviews.changes.noChanges": "No changes compared to the published version.",
 	"workflowReviews.changes.sourceLabel": "Published: {version}",
 	"workflowReviews.changes.targetLabel": "In review: {version}",
 	"workflowReviews.changes.firstPublish.sourceEmpty": "This workflow hasn't been published before.",
+	"workflowReviews.changes.closed.noChanges": "No changes compared to the previously published version.",
+	"workflowReviews.changes.closed.sourceLabel": "Previously published: {version}",
+	"workflowReviews.changes.closed.targetLabel": "Approved: {version}",
+	"workflowReviews.changes.closed.firstPublish.sourceEmpty": "This workflow hadn't been published yet.",
 	"workflowReviews.detail.notFound.title": "Review not found",
 	"workflowReviews.detail.notFound.body": "This review doesn't exist or you don't have access to it.",
 	"workflowReviews.detail.decision.trigger": "Review",
diff --git a/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewChangesSection.test.ts b/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewChangesSection.test.ts
index 1f15984e64c..1edce985c48 100644
--- a/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewChangesSection.test.ts
+++ b/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewChangesSection.test.ts
@@ -1,4 +1,6 @@
 import type {
+	WorkflowReviewRequestDecision,
+	WorkflowReviewRequestState,
 	WorkflowReviewRequestWorkflowDetail,
 	WorkflowReviewVersionSnapshot,
 } from '@n8n/api-types';
@@ -33,7 +35,16 @@ vi.mock('@/features/workflows/workflowDiff/WorkflowDiffView.vue', () => ({
 	},
 }));
 
-const renderComponent = createComponentRenderer(WorkflowReviewChangesSection);
+const renderSection = createComponentRenderer(WorkflowReviewChangesSection);
+
+/** Defaults to an open review; closed cases pass `state` and `decision` themselves. */
+const renderComponent = (options: {
+	props: {
+		workflow: WorkflowReviewRequestWorkflowDetail;
+		state?: WorkflowReviewRequestState;
+		decision?: WorkflowReviewRequestDecision;
+	};
+}) => renderSection({ props: { state: 'open', decision: 'pending', ...options.props } });
 
 function makeNode(overrides: Partial<INode> = {}): INode {
 	return {
@@ -242,6 +253,75 @@ describe('WorkflowReviewChangesSection', () => {
 		expect(isReactive(targetWorkflow?.nodes[0])).toBe(false);
 	});
 
+	describe('closed reviews', () => {
+		const approved = { state: 'closed', decision: 'approved' } as const;
+
+		it('labels the frozen baseline and the approved version', () => {
+			const { getByTestId } = renderComponent({
+				props: {
+					...approved,
+					workflow: makeWorkflow({
+						pinnedVersion: makeSnapshot({ name: 'Version hotpink' }),
+						baselineVersion: makeSnapshot({
+							versionId: '0f123890-0000-0000-0000-000000000000',
+							name: 'Version teal',
+							nodes: [makeNode({ id: 'node-removed', name: 'Removed node' }), makeNode()],
+						}),
+					}),
+				},
+			});
+
+			expect(getByTestId('workflow-review-changes-source-label')).toHaveTextContent(
+				'Previously published: Version teal',
+			);
+			expect(getByTestId('workflow-review-changes-target-label')).toHaveTextContent(
+				'Approved: Version hotpink',
+			);
+		});
+
+		// Nothing was published when this was approved, so the baseline is empty by
+		// right — not missing. The diff still renders, sourceless.
+		it('renders a sourceless diff when nothing was published at approval', () => {
+			const { getByTestId, queryByTestId } = renderComponent({
+				props: { ...approved, workflow: makeWorkflow({ baselineVersion: null }) },
+			});
+
+			expect(getByTestId('workflow-diff-view-stub')).toBeInTheDocument();
+			expect(diffViewProps[0].sourceWorkflow).toBeUndefined();
+			expect(
+				queryByTestId('workflow-review-changes-closed-without-approval'),
+			).not.toBeInTheDocument();
+		});
+
+		it('phrases the no-changes state in the past tense', () => {
+			const snapshot = makeSnapshot();
+			const { getByTestId } = renderComponent({
+				props: {
+					...approved,
+					workflow: makeWorkflow({ pinnedVersion: snapshot, baselineVersion: snapshot }),
+				},
+			});
+
+			expect(getByTestId('workflow-review-changes-no-changes')).toHaveTextContent(
+				'No changes compared to the previously published version.',
+			);
+		});
+
+		// Auto-closed by archiving, transferring or deleting the workflow: approval
+		// is the only thing that freezes a baseline, so there is nothing to diff.
+		it.each(['pending', 'changes_requested'] as const)(
+			'explains that a review closed with decision %s has no changes to compare',
+			(decision) => {
+				const { getByTestId, queryByTestId } = renderComponent({
+					props: { state: 'closed', decision, workflow: makeWorkflow() },
+				});
+
+				expect(getByTestId('workflow-review-changes-closed-without-approval')).toBeInTheDocument();
+				expect(queryByTestId('workflow-diff-view-stub')).not.toBeInTheDocument();
+			},
+		);
+	});
+
 	it('renders the diff when versions differ only by an execution flag', () => {
 		const { getByTestId, queryByTestId } = renderComponent({
 			props: {
diff --git a/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewChangesSection.vue b/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewChangesSection.vue
index de5f5cb0ceb..bca3b9b22c6 100644
--- a/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewChangesSection.vue
+++ b/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewChangesSection.vue
@@ -1,5 +1,7 @@
 <script setup lang="ts">
 import type {
+	WorkflowReviewRequestDecision,
+	WorkflowReviewRequestState,
 	WorkflowReviewRequestWorkflowDetail,
 	WorkflowReviewVersionSnapshot,
 } from '@n8n/api-types';
@@ -15,10 +17,19 @@ import type { IWorkflowDb } from '@/Interface';
 
 const props = defineProps<{
 	workflow: WorkflowReviewRequestWorkflowDetail;
+	state: WorkflowReviewRequestState;
+	decision: WorkflowReviewRequestDecision;
 }>();
 
 const i18n = useI18n();
 
+// Only approval freezes a baseline, so an approved review diffs against what was
+// published back then; a review closed any other way has nothing to diff against.
+const isApproved = computed(() => props.state === 'closed' && props.decision === 'approved');
+const isClosedWithoutApproval = computed(
+	() => props.state === 'closed' && props.decision !== 'approved',
+);
+
 /**
  * Label each side the way version history does, falling back to a short id.
  * Falsy rather than nullish: the publish endpoints accept `name: ""`.
@@ -72,25 +83,63 @@ const targetWorkflow = computed(() =>
 	props.workflow.pinnedVersion ? snapshotToWorkflow(props.workflow.pinnedVersion) : undefined,
 );
 
+// The dots track publish status, which approval flips: the approved version is
+// the published one now, and the baseline it replaced no longer is.
+const sourceDotClass = computed(() =>
+	isApproved.value ? 'statusDotSuperseded' : 'statusDotPublished',
+);
+const targetDotClass = computed(() =>
+	isApproved.value ? 'statusDotPublished' : 'statusDotInReview',
+);
+
+const noChangesText = computed(() =>
+	i18n.baseText(
+		isApproved.value
+			? 'workflowReviews.changes.closed.noChanges'
+			: 'workflowReviews.changes.noChanges',
+	),
+);
+const sourceEmptyText = computed(() =>
+	i18n.baseText(
+		isApproved.value
+			? 'workflowReviews.changes.closed.firstPublish.sourceEmpty'
+			: 'workflowReviews.changes.firstPublish.sourceEmpty',
+	),
+);
+
 const sourceLabel = computed(() =>
 	props.workflow.baselineVersion
-		? i18n.baseText('workflowReviews.changes.sourceLabel', {
-				interpolate: { version: versionLabel(props.workflow.baselineVersion) },
-			})
+		? i18n.baseText(
+				isApproved.value
+					? 'workflowReviews.changes.closed.sourceLabel'
+					: 'workflowReviews.changes.sourceLabel',
+				{ interpolate: { version: versionLabel(props.workflow.baselineVersion) } },
+			)
 		: undefined,
 );
 const targetLabel = computed(() =>
 	props.workflow.pinnedVersion
-		? i18n.baseText('workflowReviews.changes.targetLabel', {
-				interpolate: { version: versionLabel(props.workflow.pinnedVersion) },
-			})
+		? i18n.baseText(
+				isApproved.value
+					? 'workflowReviews.changes.closed.targetLabel'
+					: 'workflowReviews.changes.targetLabel',
+				{ interpolate: { version: versionLabel(props.workflow.pinnedVersion) } },
+			)
 		: undefined,
 );
 </script>
 
 <template>
 	<N8nCallout
-		v-if="!workflow.pinnedVersion"
+		v-if="isClosedWithoutApproval"
+		theme="info"
+		:class="$style.callout"
+		data-test-id="workflow-review-changes-closed-without-approval"
+	>
+		{{ i18n.baseText('workflowReviews.changes.closedWithoutApproval') }}
+	</N8nCallout>
+	<N8nCallout
+		v-else-if="!workflow.pinnedVersion"
 		theme="warning"
 		:class="$style.callout"
 		data-test-id="workflow-review-changes-version-unavailable"
@@ -103,7 +152,7 @@ const targetLabel = computed(() =>
 		:class="$style.callout"
 		data-test-id="workflow-review-changes-no-changes"
 	>
-		{{ i18n.baseText('workflowReviews.changes.noChanges') }}
+		{{ noChangesText }}
 	</N8nCallout>
 	<div v-else :class="$style.diff" data-test-id="workflow-review-changes-diff">
 		<WorkflowDiffView
@@ -116,18 +165,18 @@ const targetLabel = computed(() =>
 				no publish status to represent. -->
 			<template v-if="workflow.baselineVersion" #sourceLabel>
 				<span :class="$style.versionBadge" data-test-id="workflow-review-changes-source-label">
-					<span :class="[$style.statusDot, $style.statusDotPublished]" />
+					<span :class="[$style.statusDot, $style[sourceDotClass]]" />
 					<N8nText color="text-dark" size="small" compact>{{ sourceLabel }}</N8nText>
 				</span>
 			</template>
 			<template #targetLabel>
 				<span :class="$style.versionBadge" data-test-id="workflow-review-changes-target-label">
-					<span :class="[$style.statusDot, $style.statusDotInReview]" />
+					<span :class="[$style.statusDot, $style[targetDotClass]]" />
 					<N8nText color="text-dark" size="small" compact>{{ targetLabel }}</N8nText>
 				</span>
 			</template>
 			<template #sourceEmptyText>
-				{{ i18n.baseText('workflowReviews.changes.firstPublish.sourceEmpty') }}
+				{{ sourceEmptyText }}
 			</template>
 		</WorkflowDiffView>
 	</div>
@@ -136,6 +185,7 @@ const targetLabel = computed(() =>
 <style module lang="scss">
 .callout {
 	max-width: var(--review-callout--max-width, 34rem);
+	margin-top: var(--spacing--5xs);
 }
 
 .versionBadge {
@@ -158,6 +208,10 @@ const targetLabel = computed(() =>
 	background-color: var(--color--yellow-500);
 }
 
+.statusDotSuperseded {
+	background-color: var(--color--text--tint-1);
+}
+
 .diff {
 	height: 100%;
 	min-height: 0;
diff --git a/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewDetailTabs.test.ts b/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewDetailTabs.test.ts
index e146a2f9e9a..fc48f9776d0 100644
--- a/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewDetailTabs.test.ts
+++ b/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewDetailTabs.test.ts
@@ -11,8 +11,9 @@ import WorkflowReviewDetailTabs from './WorkflowReviewDetailTabs.vue';
 vi.mock('./WorkflowReviewChangesSection.vue', () => ({
 	default: {
 		name: 'WorkflowReviewChangesSection',
-		props: ['workflow'],
-		template: '<div data-test-id="workflow-review-changes-section" />',
+		props: ['workflow', 'state', 'decision'],
+		template:
+			'<div data-test-id="workflow-review-changes-section" :data-state="state" :data-decision="decision" />',
 	},
 }));
 
@@ -219,8 +220,10 @@ describe('WorkflowReviewDetailTabs', () => {
 			expect(getAllByTestId('workflow-review-changes-section')).toHaveLength(2);
 		});
 
-		it('shows an info state instead of diffs for a closed review', () => {
-			const { getByTestId, queryByTestId } = renderComponent({
+		// A closed review keeps its diff: the backend serves the baseline frozen at
+		// approval, and the section needs the lifecycle to phrase the sides.
+		it('renders the diff for a closed review and forwards its lifecycle', () => {
+			const { getByTestId } = renderComponent({
 				props: {
 					review: makeDetail({ state: 'closed', decision: 'approved' }),
 					tab: 'changes',
@@ -228,20 +231,21 @@ describe('WorkflowReviewDetailTabs', () => {
 				},
 			});
 
-			expect(getByTestId('workflow-review-changes-closed')).toBeInTheDocument();
-			expect(queryByTestId('workflow-review-changes-section')).not.toBeInTheDocument();
+			const section = getByTestId('workflow-review-changes-section');
+			expect(section).toHaveAttribute('data-state', 'closed');
+			expect(section).toHaveAttribute('data-decision', 'approved');
 		});
 
-		it('shows an empty state when the detail has no workflows', () => {
+		it('shows an unavailable state when the detail has no workflows left', () => {
 			const { getByTestId } = renderComponent({
 				props: {
-					review: makeDetail({ workflows: [] }),
+					review: makeDetail({ state: 'closed', workflows: [] }),
 					tab: 'changes',
 					deciding: false,
 				},
 			});
 
-			expect(getByTestId('workflow-review-changes-empty')).toBeInTheDocument();
+			expect(getByTestId('workflow-review-changes-workflow-unavailable')).toBeInTheDocument();
 		});
 
 		it('shows an error state when the detail fetch failed', () => {
@@ -250,7 +254,7 @@ describe('WorkflowReviewDetailTabs', () => {
 			});
 
 			expect(getByTestId('workflow-review-changes-unavailable')).toBeInTheDocument();
-			expect(queryByTestId('workflow-review-changes-empty')).not.toBeInTheDocument();
+			expect(queryByTestId('workflow-review-changes-workflow-unavailable')).not.toBeInTheDocument();
 		});
 	});
 
diff --git a/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewDetailTabs.vue b/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewDetailTabs.vue
index c78b65a91ef..20cd6f6fee5 100644
--- a/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewDetailTabs.vue
+++ b/packages/frontend/editor-ui/src/features/workflow-reviews/components/WorkflowReviewDetailTabs.vue
@@ -120,15 +120,7 @@ const tabOptions = computed(() => [
 
 			<div v-else :class="$style.panel" data-test-id="workflow-review-changes-panel">
 				<N8nCallout
-					v-if="review.state === 'closed'"
-					theme="info"
-					:class="$style.callout"
-					data-test-id="workflow-review-changes-closed"
-				>
-					{{ i18n.baseText('workflowReviews.changes.closed.body') }}
-				</N8nCallout>
-				<N8nCallout
-					v-else-if="!detail"
+					v-if="!detail"
 					theme="warning"
 					:class="$style.callout"
 					data-test-id="workflow-review-changes-unavailable"
@@ -140,16 +132,19 @@ const tabOptions = computed(() => [
 						v-for="workflow in detail.workflows"
 						:key="workflow.workflowId"
 						:workflow="workflow"
+						:state="detail.state"
+						:decision="detail.decision"
 					/>
 				</template>
-				<N8nText
+				<!-- No rows left: the workflow was deleted, or the requester lost access to it. -->
+				<N8nCallout
 					v-else
-					color="text-light"
-					size="medium"
-					data-test-id="workflow-review-changes-empty"
+					theme="warning"
+					:class="$style.callout"
+					data-test-id="workflow-review-changes-workflow-unavailable"
 				>
-					{{ i18n.baseText('workflowReviews.changes.empty') }}
-				</N8nText>
+					{{ i18n.baseText('workflowReviews.changes.workflowUnavailable') }}
+				</N8nCallout>
 			</div>
 
 			<WorkflowReviewDetailMetadata :review="review" />
@@ -172,6 +167,10 @@ const tabOptions = computed(() => [
 	align-items: center;
 	justify-content: space-between;
 	gap: var(--spacing--sm);
+
+	> :global(.n8n-tabs) {
+		transform: translateY(var(--spacing--xs));
+	}
 }
 
 .detailBody {
diff --git a/packages/frontend/editor-ui/src/features/workflow-reviews/views/WorkflowReviewRequestsView.test.ts b/packages/frontend/editor-ui/src/features/workflow-reviews/views/WorkflowReviewRequestsView.test.ts
index 04e177a6a1b..1f7e34392ab 100644
--- a/packages/frontend/editor-ui/src/features/workflow-reviews/views/WorkflowReviewRequestsView.test.ts
+++ b/packages/frontend/editor-ui/src/features/workflow-reviews/views/WorkflowReviewRequestsView.test.ts
@@ -30,7 +30,7 @@ vi.mock('@/app/composables/useDocumentTitle', () => ({
 vi.mock('@/features/workflow-reviews/components/WorkflowReviewChangesSection.vue', () => ({
 	default: {
 		name: 'WorkflowReviewChangesSection',
-		props: ['workflow'],
+		props: ['workflow', 'state', 'decision'],
 		template: '<div data-test-id="workflow-review-changes-section" />',
 	},
 }));