merge: Report admin UX improvements (!1060)

View MR for information: https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/1060

Approved-by: Marie <github@yuugi.dev>
Approved-by: dakkar <dakkar@thenautilus.net>

12 files changed, 642 insertions, 97 deletions

diff --git a/packages/frontend/package.json b/packages/frontend/package.json
index f5c7bcf1b4..640ebe70d6 100644
--- a/packages/frontend/package.json
+++ b/packages/frontend/package.json
@@ -60,6 +60,7 @@
 		"misskey-reversi": "workspace:*",
 		"moment": "^2.30.1",
 		"photoswipe": "5.4.4",
+		"promise-limit": "2.7.0",
 		"punycode.js": "2.3.1",
 		"rollup": "4.40.0",
 		"sanitize-html": "2.16.0",
diff --git a/packages/frontend/src/components/MkAbuseReport.vue b/packages/frontend/src/components/MkAbuseReport.vue
index c52fdb898e..5bf5380a1e 100644
--- a/packages/frontend/src/components/MkAbuseReport.vue
+++ b/packages/frontend/src/components/MkAbuseReport.vue
@@ -33,10 +33,28 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<MkFolder :withSpacer="false">
 			<template #icon><MkAvatar :user="report.targetUser" style="width: 18px; height: 18px;"/></template>
 			<template #label>{{ i18n.ts.target }}: <MkAcct :user="report.targetUser"/></template>
-			<template #suffix>#{{ report.targetUserId.toUpperCase() }}</template>
+			<template #suffix>{{ i18n.ts.id }}# {{ report.targetUserId }}</template>
 
-			<div style="height: 300px; --MI-stickyTop: 0; --MI-stickyBottom: 0;">
-				<RouterView :router="targetRouter"/>
+			<div style="--MI-stickyTop: 0; --MI-stickyBottom: 0;">
+				<admin-user :userId="report.targetUserId" :userHint="report.targetUser"></admin-user>
+			</div>
+		</MkFolder>
+
+		<MkFolder v-if="report.targetInstance" :withSpacer="false">
+			<template #icon>
+				<img
+					v-if="targetInstanceIcon"
+					:src="targetInstanceIcon"
+					:alt="i18n.tsx.instanceIconAlt({ name: report.targetInstance.name || report.targetInstance.host })"
+					:class="$style.instanceIcon"
+					class="icon"
+				/>
+			</template>
+			<template #label>{{ i18n.ts.instance }}: {{ report.targetInstance.name || report.targetInstance.host }}</template>
+			<template #suffix>{{ i18n.ts.id }}# {{ report.targetInstance.id }}</template>
+
+			<div style="--MI-stickyTop: 0; --MI-stickyBottom: 0;">
+				<instance-info :host="report.targetInstance.host" :instanceHint="report.targetInstance" :metaHint="metaHint"></instance-info>
 			</div>
 		</MkFolder>
 
@@ -44,23 +62,24 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<template #icon><i class="ti ti-message-2"></i></template>
 			<template #label>{{ i18n.ts.details }}</template>
 			<div class="_gaps_s">
-				<Mfm :text="report.comment" :isBlock="true" :linkNavigationBehavior="'window'"/>
+				<Mfm :text="report.comment" :parsedNodes="parsedComment" :isBlock="true" :linkNavigationBehavior="'window'" :author="report.reporter" :nyaize="false" :isAnim="false"/>
+				<SkUrlPreviewGroup :sourceNodes="parsedComment" :compact="false" :detail="false" :showAsQuote="true"/>
 			</div>
 		</MkFolder>
 
 		<MkFolder :withSpacer="false">
 			<template #icon><MkAvatar :user="report.reporter" style="width: 18px; height: 18px;"/></template>
 			<template #label>{{ i18n.ts.reporter }}: <MkAcct :user="report.reporter"/></template>
-			<template #suffix>#{{ report.reporterId.toUpperCase() }}</template>
+			<template #suffix>{{ i18n.ts.id }}# {{ report.reporterId }}</template>
 
-			<div style="height: 300px; --MI-stickyTop: 0; --MI-stickyBottom: 0;">
-				<RouterView :router="reporterRouter"/>
+			<div style="--MI-stickyTop: 0; --MI-stickyBottom: 0;">
+				<admin-user :userId="report.reporterId" :userHint="report.reporter"></admin-user>
 			</div>
 		</MkFolder>
 
 		<MkFolder :defaultOpen="false">
 			<template #icon><i class="ti ti-message-2"></i></template>
-			<template #label>{{ i18n.ts.moderationNote }}</template>
+			<template #label>{{ i18n.ts.staffNotes }}</template>
 			<template #suffix>{{ moderationNote.length > 0 ? '...' : i18n.ts.none }}</template>
 			<div class="_gaps_s">
 				<MkTextarea v-model="moderationNote" manualSave>
@@ -78,8 +97,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { provide, ref, watch } from 'vue';
+import { computed, provide, ref, watch } from 'vue';
 import * as Misskey from 'misskey-js';
+import * as mfm from '@transfem-org/sfm-js';
 import MkButton from '@/components/MkButton.vue';
 import MkSwitch from '@/components/MkSwitch.vue';
 import MkKeyValue from '@/components/MkKeyValue.vue';
@@ -91,6 +111,12 @@ import RouterView from '@/components/global/RouterView.vue';
 import MkTextarea from '@/components/MkTextarea.vue';
 import { copyToClipboard } from '@/utility/copy-to-clipboard.js';
 import { createRouter } from '@/router.js';
+import { getProxiedImageUrlNullable } from '@/utility/media-proxy';
+import InstanceInfo from '@/pages/instance-info.vue';
+import { iAmAdmin } from '@/i';
+import { misskeyApi } from '@/utility/misskey-api';
+import AdminUser from '@/pages/admin-user.vue';
+import SkUrlPreviewGroup from '@/components/SkUrlPreviewGroup.vue';
 
 const props = defineProps<{
 	report: Misskey.entities.AdminAbuseUserReportsResponse[number];
@@ -100,10 +126,27 @@ const emit = defineEmits<{
 	(ev: 'resolved', reportId: string): void;
 }>();
 
+/*
 const targetRouter = createRouter(`/admin/user/${props.report.targetUserId}`);
 targetRouter.init();
 const reporterRouter = createRouter(`/admin/user/${props.report.reporterId}`);
 reporterRouter.init();
+*/
+
+const parsedComment = computed(() => mfm.parse(props.report.comment));
+const metaHint = ref<Misskey.entities.AdminMetaResponse | undefined>(undefined);
+
+const targetInstanceIcon = computed(() => props.report.targetInstance?.faviconUrl
+	? getProxiedImageUrlNullable(props.report.targetInstance.faviconUrl, 'preview')
+	: props.report.targetInstance?.iconUrl
+		? getProxiedImageUrlNullable(props.report.targetInstance.iconUrl, 'preview')
+		: null);
+
+if (iAmAdmin) {
+	misskeyApi('admin/meta')
+		.then(meta => metaHint.value = meta)
+		.catch(err => console.error('[MkAbuseReport] Error fetching meta:', err));
+}
 
 const moderationNote = ref(props.report.moderationNote ?? '');
 
@@ -150,4 +193,8 @@ function showMenu(ev: MouseEvent) {
 </script>
 
 <style lang="scss" module>
+.instanceIcon {
+	width: 18px;
+	height: 18px;
+}
 </style>
diff --git a/packages/frontend/src/components/MkUrlPreview.vue b/packages/frontend/src/components/MkUrlPreview.vue
index 69a1540600..5d0e6e3df7 100644
--- a/packages/frontend/src/components/MkUrlPreview.vue
+++ b/packages/frontend/src/components/MkUrlPreview.vue
@@ -99,13 +99,24 @@ SPDX-License-Identifier: AGPL-3.0-only
 </div>
 </template>
 
+<script lang="ts">
+// eslint-disable-next-line import/order
+import type { summaly } from '@misskey-dev/summaly';
+
+export type SummalyResult = Awaited<ReturnType<typeof summaly>> & {
+	haveNoteLocally?: boolean,
+	linkAttribution?: {
+		userId: string,
+	}
+};
+</script>
+
 <script lang="ts" setup>
 import { defineAsyncComponent, onDeactivated, onUnmounted, ref } from 'vue';
 import { url as local } from '@@/js/config.js';
 import { versatileLang } from '@@/js/intl-const.js';
 import * as Misskey from 'misskey-js';
 import { maybeMakeRelative } from '@@/js/url.js';
-import type { summaly } from '@misskey-dev/summaly';
 import { i18n } from '@/i18n.js';
 import * as os from '@/os.js';
 import { deviceKind } from '@/utility/device-kind.js';
@@ -119,8 +130,6 @@ import DynamicNoteSimple from '@/components/DynamicNoteSimple.vue';
 import { $i } from '@/i';
 import { userPage } from '@/filters/user.js';
 
-type SummalyResult = Awaited<ReturnType<typeof summaly>>;
-
 const props = withDefaults(defineProps<{
 	url: string;
 	detail?: boolean;
@@ -128,12 +137,18 @@ const props = withDefaults(defineProps<{
 	showAsQuote?: boolean;
 	showActions?: boolean;
 	skipNoteIds?: (string | undefined)[];
+	previewHint?: SummalyResult;
+	noteHint?: Misskey.entities.Note | null;
+	attributionHint?: Misskey.entities.User | null;
 }>(), {
 	detail: false,
 	compact: false,
 	showAsQuote: false,
 	showActions: true,
 	skipNoteIds: undefined,
+	previewHint: undefined,
+	noteHint: undefined,
+	attributionHint: undefined,
 });
 
 const MOBILE_THRESHOLD = 500;
@@ -170,12 +185,35 @@ const tweetHeight = ref(150);
 const unknownUrl = ref(false);
 const theNote = ref<Misskey.entities.Note | null>(null);
 const fetchingTheNote = ref(false);
+const fetchingAttribution = ref<Promise<void> | null>(null);
 
 onDeactivated(() => {
 	playerEnabled.value = false;
 });
 
-async function fetchNote() {
+async function fetchAttribution(initial: boolean): Promise<void> {
+	if (!linkAttribution.value) return;
+	if (attributionUser.value) return;
+	if (fetchingAttribution.value) return fetchingAttribution.value;
+
+	return fetchingAttribution.value ??= (async (userId: string): Promise<void> => {
+		try {
+			if (initial && props.attributionHint !== undefined) {
+				attributionUser.value = props.attributionHint;
+			} else {
+				attributionUser.value = await misskeyApi('users/show', { userId });
+			}
+		} catch {
+			// makes the loading ellipsis vanish.
+			linkAttribution.value = null;
+		} finally {
+			// Reset promise to mark as done
+			fetchingAttribution.value = null;
+		}
+	})(linkAttribution.value.userId);
+}
+
+async function fetchNote(initial: boolean) {
 	if (!props.showAsQuote) return;
 	if (!activityPub.value) return;
 	if (theNote.value) return;
@@ -183,8 +221,15 @@ async function fetchNote() {
 
 	fetchingTheNote.value = true;
 	try {
-		const response = await misskeyApi('ap/show', { uri: activityPub.value });
+		const response = (initial && props.noteHint !== undefined)
+			? { type: 'Note', object: props.noteHint }
+			: await misskeyApi('ap/show', { uri: activityPub.value });
 		if (response.type !== 'Note') return;
+		if (!response.object) {
+			activityPub.value = null;
+			theNote.value = null;
+			return;
+		}
 		const theNoteId = response['object'].id;
 		if (theNoteId && props.skipNoteIds && props.skipNoteIds.includes(theNoteId)) {
 			hidePreview.value = true;
@@ -210,13 +255,16 @@ if (requestUrl.hostname === 'twitter.com' || requestUrl.hostname === 'mobile.twi
 	if (m) tweetId.value = m[1];
 }
 
+// This is now handled on the backend
+/*
 if (requestUrl.hostname === 'music.youtube.com' && requestUrl.pathname.match('^/(?:watch|channel)')) {
 	requestUrl.hostname = 'www.youtube.com';
 }
 
 requestUrl.hash = '';
+*/
 
-function refresh(withFetch = false) {
+function refresh(withFetch = false, initial = false) {
 	const params = new URLSearchParams({
 		url: requestUrl.href,
 		lang: versatileLang,
@@ -226,23 +274,21 @@ function refresh(withFetch = false) {
 	}
 
 	const headers = $i ? { Authorization: `Bearer ${$i.token}` } : undefined;
-	return fetching.value ??= window.fetch(`/url?${params.toString()}`, { headers })
-		.then(res => {
-			if (!res.ok) {
-				if (_DEV_) {
-					console.warn(`[HTTP${res.status}] Failed to fetch url preview`);
+	const fetchPromise: Promise<SummalyResult | null> = (initial && props.previewHint)
+		? Promise.resolve(props.previewHint)
+		: window.fetch(`/url?${params.toString()}`, { headers })
+			.then(res => {
+				if (!res.ok) {
+					if (_DEV_) {
+						console.warn(`[HTTP${res.status}] Failed to fetch url preview`);
+					}
+					return null;
 				}
-				return null;
-			}
 
-			return res.json();
-		})
-		.then(async (info: SummalyResult & {
-			haveNoteLocally?: boolean,
-			linkAttribution?: {
-				userId: string,
-			}
-		} | null) => {
+				return res.json();
+			});
+	return fetching.value ??= fetchPromise
+		.then(async (info: SummalyResult | null) => {
 			unknownUrl.value = info == null;
 			title.value = info?.title ?? null;
 			description.value = info?.description ?? null;
@@ -258,20 +304,15 @@ function refresh(withFetch = false) {
 			sensitive.value = info?.sensitive ?? false;
 			activityPub.value = info?.activityPub ?? null;
 			linkAttribution.value = info?.linkAttribution ?? null;
-			if (linkAttribution.value) {
-				try {
-					const response = await misskeyApi('users/show', { userId: linkAttribution.value.userId });
-					attributionUser.value = response;
-				} catch {
-					// makes the loading ellipsis vanish.
-					linkAttribution.value = null;
-				}
-			}
 
+			// These will be populated by the fetch* functions
+			attributionUser.value = null;
 			theNote.value = null;
-			if (info?.haveNoteLocally) {
-				await fetchNote();
-			}
+
+			await Promise.all([
+				fetchAttribution(initial),
+				fetchNote(initial),
+			]);
 		})
 		.finally(() => {
 			fetching.value = null;
@@ -304,7 +345,7 @@ onUnmounted(() => {
 });
 
 // Load initial data
-refresh();
+refresh(false, true);
 </script>
 
 <style lang="scss" module>
@@ -388,7 +429,7 @@ refresh();
 .body {
 	position: relative;
 	box-sizing: border-box;
-	padding: 16px;
+	padding: 16px !important; // Unfortunately needed to win a specificity race with MkNoteSimple / SkNoteSimple
 }
 
 .header {
diff --git a/packages/frontend/src/components/SkDateSeparatedList.vue b/packages/frontend/src/components/SkDateSeparatedList.vue
new file mode 100644
index 0000000000..239d0c1939
--- /dev/null
+++ b/packages/frontend/src/components/SkDateSeparatedList.vue
@@ -0,0 +1,55 @@
+<!--
+SPDX-FileCopyrightText: hazelnoot and other Sharkey contributors
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div class="_gaps">
+	<template v-for="(item, index) in timeline" :key="item.id">
+		<slot v-if="item.type === 'item'" :id="item.id" :index="index" :item="item.data"></slot>
+		<slot v-else-if="item.type === 'date'" :id="item.id" :index="index" :prev="item.prev" :prevText="item.prevText" :next="item.next" :nextText="item.nextText" name="date">
+			<div :class="$style.dateDivider">
+				<span><i class="ti ti-chevron-up"></i> {{ item.nextText }}</span>
+				<span :class="$style.dateSeparator"></span>
+				<span>{{ item.prevText }} <i class="ti ti-chevron-down"></i></span>
+			</div>
+		</slot>
+	</template>
+</div>
+</template>
+
+<script setup lang="ts" generic="T extends { id: string; createdAt: string; }">
+import { computed } from 'vue';
+import { makeDateSeparatedTimelineComputedRef } from '@/utility/timeline-date-separate';
+
+const props = defineProps<{
+	items: T[],
+}>();
+
+const itemsRef = computed(() => props.items);
+const timeline = makeDateSeparatedTimelineComputedRef(itemsRef);
+</script>
+
+<style module lang="scss">
+// From room.vue
+.dateDivider {
+	display: flex;
+	font-size: 85%;
+	align-items: center;
+	justify-content: center;
+	gap: 0.5em;
+	opacity: 0.75;
+	border: solid 0.5px var(--MI_THEME-divider);
+	border-radius: 999px;
+	width: fit-content;
+	padding: 0.5em 1em;
+	margin: 0 auto;
+}
+
+// From room.vue
+.dateSeparator {
+	height: 1em;
+	width: 1px;
+	background: var(--MI_THEME-divider);
+}
+</style>
diff --git a/packages/frontend/src/components/SkUrlPreviewGroup.vue b/packages/frontend/src/components/SkUrlPreviewGroup.vue
new file mode 100644
index 0000000000..32b11d9db4
--- /dev/null
+++ b/packages/frontend/src/components/SkUrlPreviewGroup.vue
@@ -0,0 +1,348 @@
+<!--
+SPDX-FileCopyrightText: hazelnoot and other Sharkey contributors
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div v-if="isRefreshing">
+	<MkLoading :class="$style.loading"></MkLoading>
+</div>
+<template v-else>
+	<MkUrlPreview
+		v-for="preview of urlPreviews"
+		:key="preview.url"
+		:url="preview.url"
+		:previewHint="preview"
+		:noteHint="preview.note"
+		:attributionHint="preview.attributionUser"
+		:detail="detail"
+		:compact="compact"
+		:showAsQuote="showAsQuote"
+		:showActions="showActions"
+		:skipNoteIds="skipNoteIds"
+	></MkUrlPreview>
+</template>
+</template>
+
+<script setup lang="ts">
+import * as Misskey from 'misskey-js';
+import * as mfm from '@transfem-org/sfm-js';
+import { computed, ref, watch } from 'vue';
+import { versatileLang } from '@@/js/intl-const';
+import promiseLimit from 'promise-limit';
+import type { SummalyResult } from '@/components/MkUrlPreview.vue';
+import { extractPreviewUrls } from '@/utility/extract-preview-urls';
+import { extractUrlFromMfm } from '@/utility/extract-url-from-mfm';
+import { $i } from '@/i';
+import { misskeyApi } from '@/utility/misskey-api';
+import MkUrlPreview from '@/components/MkUrlPreview.vue';
+import { getNoteUrls } from '@/utility/getNoteUrls';
+
+type Summary = SummalyResult & {
+	note?: Misskey.entities.Note | null;
+	attributionUser?: Misskey.entities.User | null;
+};
+
+type Limiter<T> = ReturnType<typeof promiseLimit<T>>;
+
+const props = withDefaults(defineProps<{
+	sourceUrls?: string[];
+	sourceNodes?: mfm.MfmNode[];
+	sourceText?: string;
+	sourceNote?: Misskey.entities.Note;
+
+	detail?: boolean;
+	compact?: boolean;
+	showAsQuote?: boolean;
+	showActions?: boolean;
+	skipNoteIds?: string[];
+}>(), {
+	sourceUrls: undefined,
+	sourceText: undefined,
+	sourceNodes: undefined,
+	sourceNote: undefined,
+
+	detail: undefined,
+	compact: undefined,
+	showAsQuote: undefined,
+	showActions: undefined,
+	skipNoteIds: () => [],
+});
+
+const urlPreviews = ref<Summary[]>([]);
+
+const urls = computed<string[]>(() => {
+	if (props.sourceUrls) {
+		return props.sourceUrls;
+	}
+
+	// sourceNodes > sourceText > sourceNote
+	const source =
+		props.sourceNodes ??
+		(props.sourceText ? mfm.parse(props.sourceText) : null) ??
+		(props.sourceNote?.text ? mfm.parse(props.sourceNote.text) : null);
+
+	if (source) {
+		if (props.sourceNote) {
+			return extractPreviewUrls(props.sourceNote, source);
+		} else {
+			return extractUrlFromMfm(source);
+		}
+	}
+
+	return [];
+});
+
+// todo un-ref these
+const isRefreshing = ref<Promise<void> | false>(false);
+const cachedNotes = ref(new Map<string, Misskey.entities.Note | null>());
+const cachedPreviews = ref(new Map<string, Summary | null>());
+const cachedUsers = new Map<string, Misskey.entities.User | null>();
+
+/**
+ * Refreshes the group.
+ * Calls are automatically de-duplicated.
+ */
+function refresh(): Promise<void> {
+	if (isRefreshing.value) return isRefreshing.value;
+
+	const promise = doRefresh();
+	promise.finally(() => isRefreshing.value = false);
+	isRefreshing.value = promise;
+	return promise;
+}
+
+/**
+ * Refreshes the group.
+ * Don't call this directly - use refresh() instead!
+ */
+async function doRefresh(): Promise<void> {
+	let previews = await fetchPreviews();
+
+	// Remove duplicates
+	previews = deduplicatePreviews(previews);
+
+	// Remove any with hidden notes
+	previews = previews.filter(preview => !preview.note || !props.skipNoteIds.includes(preview.note.id));
+
+	urlPreviews.value = previews;
+}
+
+async function fetchPreviews(): Promise<Summary[]> {
+	const userLimiter = promiseLimit<Misskey.entities.User | null>(4);
+	const noteLimiter = promiseLimit<Misskey.entities.Note | null>(2);
+	const summaryLimiter = promiseLimit<Summary | null>(5);
+
+	const summaries = await Promise.all(urls.value.map(url =>
+		summaryLimiter(async () => {
+			return await fetchPreview(url);
+		}).then(async (summary) => {
+			if (summary) {
+				await Promise.all([
+					attachNote(summary, noteLimiter),
+					attachAttribution(summary, userLimiter),
+				]);
+			}
+
+			return summary;
+		})));
+
+	return summaries.filter((preview): preview is Summary => preview != null);
+}
+
+async function fetchPreview(url: string): Promise<Summary | null> {
+	const cached = cachedPreviews.value.get(url);
+	if (cached) {
+		return cached;
+	}
+
+	const headers = $i ? { Authorization: `Bearer ${$i.token}` } : undefined;
+	const params = new URLSearchParams({ url, lang: versatileLang });
+	const res = await window.fetch(`/url?${params.toString()}`, { headers }).catch(() => null);
+
+	if (res?.ok) {
+		// Success - got the summary
+		const summary: Summary = await res.json();
+		cachedPreviews.value.set(url, summary);
+		if (summary.url !== url) {
+			cachedPreviews.value.set(summary.url, summary);
+		}
+		return summary;
+	}
+
+	// Failed, blocked, or not found
+	cachedPreviews.value.set(url, null);
+	return null;
+}
+
+async function attachNote(summary: Summary, noteLimiter: Limiter<Misskey.entities.Note | null>): Promise<void> {
+	if (props.showAsQuote && summary.activityPub && summary.haveNoteLocally) {
+		// Have to pull this out to make TS happy
+		const noteUri = summary.activityPub;
+
+		summary.note = await noteLimiter(async () => {
+			return await fetchNote(noteUri);
+		});
+	}
+}
+
+async function fetchNote(noteUri: string): Promise<Misskey.entities.Note | null> {
+	const cached = cachedNotes.value.get(noteUri);
+	if (cached) {
+		return cached;
+	}
+
+	const response = await misskeyApi('ap/show', { uri: noteUri }).catch(() => null);
+	if (response && response.type === 'Note') {
+		const note = response['object'];
+
+		// Success - got the note
+		cachedNotes.value.set(noteUri, note);
+		if (note.uri && note.uri !== noteUri) {
+			cachedNotes.value.set(note.uri, note);
+		}
+		return note;
+	}
+
+	// Failed, blocked, or not found
+	cachedNotes.value.set(noteUri, null);
+	return null;
+}
+
+async function attachAttribution(summary: Summary, userLimiter: Limiter<Misskey.entities.User | null>): Promise<void> {
+	if (summary.linkAttribution) {
+		// Have to pull this out to make TS happy
+		const userId = summary.linkAttribution.userId;
+
+		summary.attributionUser = await userLimiter(async () => {
+			return await fetchUser(userId);
+		});
+	}
+}
+
+async function fetchUser(userId: string): Promise<Misskey.entities.User | null> {
+	const cached = cachedUsers.get(userId);
+	if (cached) {
+		return cached;
+	}
+
+	const user = await misskeyApi('users/show', { userId }).catch(() => null);
+
+	cachedUsers.set(userId, user);
+	return user;
+}
+
+function deduplicatePreviews(previews: Summary[]): Summary[] {
+	// eslint-disable-next-line no-param-reassign
+	previews = previews
+		// Remove any previews with duplicate URL
+		.filter((preview, index) => !previews.some((p, i) => {
+			// Skip the current preview (don't count self as duplicate).
+			if (p === preview) return false;
+
+			// Skip differing URLs (not duplicate).
+			if (p.url !== preview.url) return false;
+
+			// Skip if we have AP and the other doesn't
+			if (preview.activityPub && !p.activityPub) return false;
+
+			// Skip if we have a note and the other doesn't
+			if (preview.note && !p.note) return false;
+
+			// Skip later previews (keep the earliest instance)...
+			// ...but only if we have AP or the later one doesn't...
+			// ...and only if we have note or the later one doesn't.
+			if (i > index && (preview.activityPub || !p.activityPub) && (preview.note || !p.note)) return false;
+
+			// If we get here, then "preview" is a duplicate of "p" and should be skipped.
+			return true;
+		}));
+
+	// eslint-disable-next-line no-param-reassign
+	previews = previews
+		// Remove any previews with duplicate AP
+		.filter((preview, index) => !previews.some((p, i) => {
+			// Skip the current preview (don't count self as duplicate).
+			if (p === preview) return false;
+
+			// Skip if we don't have AP
+			if (!preview.activityPub) return false;
+
+			// Skip if other does not have AP
+			if (!p.activityPub) return false;
+
+			// Skip differing URLs (not duplicate).
+			if (p.activityPub !== preview.activityPub) return false;
+
+			// Skip later previews (keep the earliest instance)
+			if (i > index) return false;
+
+			// If we get here, then "preview" is a duplicate of "p" and should be skipped.
+			return true;
+		}));
+
+	// eslint-disable-next-line no-param-reassign
+	previews = previews
+		// Remove any previews with duplicate note
+		.filter((preview, index) => !previews.some((p, i) => {
+			// Skip the current preview (don't count self as duplicate).
+			if (p === preview) return false;
+
+			// Skip if we don't have a note
+			if (!preview.note) return false;
+
+			// Skip if other does not have a note
+			if (!p.note) return false;
+
+			// Skip differing notes (not duplicate).
+			if (p.note.id !== preview.note.id) return false;
+
+			// Skip later previews (keep the earliest instance)
+			if (i > index) return false;
+
+			// If we get here, then "preview" is a duplicate of "p" and should be skipped.
+			return true;
+		}));
+
+	// eslint-disable-next-line no-param-reassign
+	previews = previews
+		// Remove any previews where the note duplicates url
+		.filter((preview, index) => !previews.some((p, i) => {
+			// Skip the current preview (don't count self as duplicate).
+			if (p === preview) return false;
+
+			// Skip if we have a note
+			if (preview.note) return false;
+
+			// Skip if other does not have a note
+			if (!p.note) return false;
+
+			// Skip later previews (keep the earliest instance)
+			if (i > index) return false;
+
+			const noteUrls = getNoteUrls(p.note);
+
+			// Remove if other duplicates our AP URL
+			if (preview.activityPub && noteUrls.includes(preview.activityPub)) return true;
+
+			// Remove if other duplicates our main URL
+			return noteUrls.includes(preview.url);
+		}));
+
+	return previews;
+}
+
+// Kick everything off, and watch for changes.
+watch(
+	[urls, () => props.showAsQuote, () => props.skipNoteIds],
+	() => refresh(),
+	{ immediate: true },
+);
+</script>
+
+<style module lang="scss">
+.loading {
+	box-shadow: 0 0 0 1px var(--MI_THEME-divider);
+	border-radius: var(--MI-radius-sm);
+}
+</style>
diff --git a/packages/frontend/src/components/global/PageWithHeader.vue b/packages/frontend/src/components/global/PageWithHeader.vue
index d2e59bf4ad..485ea687de 100644
--- a/packages/frontend/src/components/global/PageWithHeader.vue
+++ b/packages/frontend/src/components/global/PageWithHeader.vue
@@ -6,8 +6,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 <template>
 <div ref="rootEl" :class="[$style.root, reversed ? '_pageScrollableReversed' : '_pageScrollable']">
 	<MkStickyContainer>
-		<template #header><MkPageHeader v-model:tab="tab" v-bind="pageHeaderProps"/></template>
-		<div :class="$style.body">
+		<template #header><MkPageHeader v-model:tab="tab" v-bind="pageHeaderProps" :class="{ _spacer: spacer }"/></template>
+		<div :class="[ $style.body, { _spacer: spacer } ]">
 			<MkSwiper v-if="swipable && (props.tabs?.length ?? 1) > 1" v-model:tab="tab" :class="$style.swiper" :tabs="props.tabs" :page="props.page">
 				<slot></slot>
 			</MkSwiper>
@@ -30,13 +30,16 @@ const props = withDefaults(defineProps<PageHeaderProps & {
 	reversed?: boolean;
 	swipable?: boolean;
 	page?: string;
+	spacer?: boolean;
 }>(), {
 	reversed: false,
 	swipable: true,
+	page: undefined,
+	spacer: false,
 });
 
 const pageHeaderProps = computed(() => {
-	const { reversed, ...rest } = props;
+	const { reversed, spacer, ...rest } = props;
 	return rest;
 });
 
diff --git a/packages/frontend/src/pages/admin-user.vue b/packages/frontend/src/pages/admin-user.vue
index 0596b165fd..3d17aca7d9 100644
--- a/packages/frontend/src/pages/admin-user.vue
+++ b/packages/frontend/src/pages/admin-user.vue
@@ -4,8 +4,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<PageWithHeader v-model:tab="tab" :actions="headerActions" :tabs="headerTabs">
-	<div class="_spacer" style="--MI_SPACER-w: 600px; --MI_SPACER-min: 16px; --MI_SPACER-max: 32px;">
+<PageWithHeader v-model:tab="tab" :actions="headerActions" :tabs="headerTabs" :spacer="true" style="--MI_SPACER-w: 600px; --MI_SPACER-min: 16px; --MI_SPACER-max: 32px;">
+	<div>
 		<FormSuspense :p="init">
 			<div v-if="tab === 'overview'" class="_gaps">
 				<div v-if="user" class="aeakzknw">
@@ -273,8 +273,14 @@ import SkBadgeStrip from '@/components/SkBadgeStrip.vue';
 const props = withDefaults(defineProps<{
 	userId: string;
 	initialTab?: string;
+	userHint?: Misskey.entities.UserDetailed;
+	infoHint?: Misskey.entities.AdminShowUserResponse;
+	ipsHint?: Misskey.entities.AdminGetUserIpsResponse;
 }>(), {
 	initialTab: 'overview',
+	userHint: undefined,
+	infoHint: undefined,
+	ipsHint: undefined,
 });
 
 const tab = ref(props.initialTab);
@@ -405,16 +411,23 @@ const announcementsPagination = {
 };
 const expandedRoles = ref([]);
 
-function createFetcher() {
-	return () => Promise.all([misskeyApi('users/show', {
-		userId: props.userId,
-	}), misskeyApi('admin/show-user', {
-		userId: props.userId,
-	}), iAmAdmin ? misskeyApi('admin/get-user-ips', {
-		userId: props.userId,
-	}) : Promise.resolve(null), iAmAdmin ? misskeyApi('ap/get', {
-		uri: `${url}/users/${props.userId}`,
-	}).catch(() => null) : null]).then(([_user, _info, _ips, _ap]) => {
+function createFetcher(withHint = true) {
+	return () => Promise.all([
+		(withHint && props.userHint) ? props.userHint : misskeyApi('users/show', {
+			userId: props.userId,
+		}),
+		(withHint && props.infoHint) ? props.infoHint : misskeyApi('admin/show-user', {
+			userId: props.userId,
+		}),
+		iAmAdmin
+			? (withHint && props.ipsHint) ? props.ipsHint : misskeyApi('admin/get-user-ips', {
+				userId: props.userId,
+			})
+			: null,
+		iAmAdmin ? misskeyApi('ap/get', {
+			uri: `${url}/users/${props.userId}`,
+		}).catch(() => null) : null],
+	).then(([_user, _info, _ips, _ap]) => {
 		user.value = _user;
 		info.value = _info;
 		ips.value = _ips;
@@ -432,7 +445,7 @@ function createFetcher() {
 
 async function refreshUser() {
 	// Not a typo - createFetcher() returns a function()
-	await createFetcher()();
+	await createFetcher(false)();
 }
 
 async function onMandatoryCWChanged(value: string) {
diff --git a/packages/frontend/src/pages/admin/abuses.vue b/packages/frontend/src/pages/admin/abuses.vue
index 4ec4372492..6531a3e49d 100644
--- a/packages/frontend/src/pages/admin/abuses.vue
+++ b/packages/frontend/src/pages/admin/abuses.vue
@@ -48,9 +48,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 			-->
 
 			<MkPagination v-slot="{items}" ref="reports" :pagination="pagination" :displayLimit="50">
-				<div class="_gaps">
-					<XAbuseReport v-for="report in items" :key="report.id" :report="report" @resolved="resolved"/>
-				</div>
+				<SkDateSeparatedList v-slot="{ item: report }" :items="items">
+					<XAbuseReport :report="report" @resolved="resolved"/>
+				</SkDateSeparatedList>
 			</MkPagination>
 		</div>
 	</div>
@@ -67,6 +67,7 @@ import { definePage } from '@/page.js';
 import MkButton from '@/components/MkButton.vue';
 import MkInfo from '@/components/MkInfo.vue';
 import { store } from '@/store.js';
+import SkDateSeparatedList from '@/components/SkDateSeparatedList.vue';
 
 const reports = useTemplateRef('reports');
 
diff --git a/packages/frontend/src/pages/instance-info.vue b/packages/frontend/src/pages/instance-info.vue
index b60bdf3a72..3f14cdabbe 100644
--- a/packages/frontend/src/pages/instance-info.vue
+++ b/packages/frontend/src/pages/instance-info.vue
@@ -4,8 +4,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<PageWithHeader v-model:tab="tab" :actions="headerActions" :tabs="headerTabs" :swipable="true">
-	<div v-if="instance" class="_spacer" style="--MI_SPACER-w: 600px; --MI_SPACER-min: 16px; --MI_SPACER-max: 32px;">
+<PageWithHeader v-model:tab="tab" :actions="headerActions" :tabs="headerTabs" :spacer="true" style="--MI_SPACER-w: 600px; --MI_SPACER-min: 16px; --MI_SPACER-max: 32px;">
+	<div v-if="instance">
 		<!-- This empty div is preserved to avoid merge conflicts -->
 		<div>
 			<div v-if="tab === 'overview'" class="_gaps">
@@ -238,9 +238,14 @@ import SkBadgeStrip from '@/components/SkBadgeStrip.vue';
 
 const $style = useCssModule();
 
-const props = defineProps<{
+const props = withDefaults(defineProps<{
 	host: string;
-}>();
+	metaHint?: Misskey.entities.AdminMetaResponse;
+	instanceHint?: Misskey.entities.FederationInstance;
+}>(), {
+	metaHint: undefined,
+	instanceHint: undefined,
+});
 
 const tab = ref('overview');
 
@@ -363,12 +368,16 @@ async function saveModerationNote() {
 	}
 }
 
-async function fetch(): Promise<void> {
+async function fetch(withHint = false): Promise<void> {
 	const [m, i] = await Promise.all([
-		iAmAdmin ? misskeyApi('admin/meta') : null,
-		misskeyApi('federation/show-instance', {
-			host: props.host,
-		}),
+		(withHint && props.metaHint)
+			? props.metaHint
+			: iAmAdmin ? misskeyApi('admin/meta') : null,
+		(withHint && props.instanceHint)
+			? props.instanceHint
+			: misskeyApi('federation/show-instance', {
+				host: props.host,
+			}),
 	]);
 	meta.value = m;
 	instance.value = i;
@@ -531,7 +540,7 @@ async function severAllFollowRelations(): Promise<void> {
 	});
 }
 
-fetch();
+fetch(true);
 
 const headerActions = computed(() => [{
 	text: `https://${props.host}`,
diff --git a/packages/frontend/src/utility/extract-preview-urls.ts b/packages/frontend/src/utility/extract-preview-urls.ts
index 5fc9c87a32..e3bd62c993 100644
--- a/packages/frontend/src/utility/extract-preview-urls.ts
+++ b/packages/frontend/src/utility/extract-preview-urls.ts
@@ -3,35 +3,18 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import * as config from '@@/js/config.js';
 import type * as Misskey from 'misskey-js';
 import type * as mfm from '@transfem-org/sfm-js';
 import { extractUrlFromMfm } from '@/utility/extract-url-from-mfm.js';
+import { getNoteUrls } from '@/utility/getNoteUrls';
 
 /**
  * Extracts all previewable URLs from a note.
  */
 export function extractPreviewUrls(note: Misskey.entities.Note, contents: mfm.MfmNode[]): string[] {
 	const links = extractUrlFromMfm(contents);
-	return links.filter(url =>
-		// Remote note
-		url !== note.url &&
-		url !== note.uri &&
-		// Local note
-		url !== `${config.url}/notes/${note.id}` &&
-		// Remote reply
-		url !== note.reply?.url &&
-		url !== note.reply?.uri &&
-		// Local reply
-		url !== `${config.url}/notes/${note.reply?.id}` &&
-		// Remote renote or quote
-		url !== note.renote?.url &&
-		url !== note.renote?.uri &&
-		// Local renote or quote
-		url !== `${config.url}/notes/${note.renote?.id}` &&
-		// Remote renote *of* a quote
-		url !== note.renote?.renote?.url &&
-		url !== note.renote?.renote?.uri &&
-		// Local renote *of* a quote
-		url !== `${config.url}/notes/${note.renote?.renote?.id}`);
+	if (links.length < 0) return [];
+
+	const self = getNoteUrls(note);
+	return links.filter(url => !self.includes(url));
 }
diff --git a/packages/frontend/src/utility/getNoteUrls.ts b/packages/frontend/src/utility/getNoteUrls.ts
new file mode 100644
index 0000000000..efd014cbf0
--- /dev/null
+++ b/packages/frontend/src/utility/getNoteUrls.ts
@@ -0,0 +1,44 @@
+/*
+ * SPDX-FileCopyrightText: hazelnoot and other Sharkey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import * as config from '@@/js/config.js';
+import type * as Misskey from 'misskey-js';
+
+export function getNoteUrls(note: Misskey.entities.Note): string[] {
+	const urls: string[] = [
+		// Any note
+		`${config.url}/notes/${note.id}`,
+	];
+
+	// Remote note
+	if (note.url) urls.push(note.url);
+	if (note.uri) urls.push(note.uri);
+
+	if (note.reply) {
+		// Any Reply
+		urls.push(`${config.url}/notes/${note.reply.id}`);
+		// Remote Reply
+		if (note.reply.url) urls.push(note.reply.url);
+		if (note.reply.uri) urls.push(note.reply.uri);
+	}
+
+	if (note.renote) {
+		// Any Renote
+		urls.push(`${config.url}/notes/${note.renote.id}`);
+		// Remote Renote
+		if (note.renote.url) urls.push(note.renote.url);
+		if (note.renote.uri) urls.push(note.renote.uri);
+	}
+
+	if (note.renote?.renote) {
+		// Any Quote
+		urls.push(`${config.url}/notes/${note.renote.renote.id}`);
+		// Remote Quote
+		if (note.renote.renote.url) urls.push(note.renote.renote.url);
+		if (note.renote.renote.uri) urls.push(note.renote.renote.uri);
+	}
+
+	return urls;
+}
diff --git a/packages/frontend/src/utility/timeline-date-separate.ts b/packages/frontend/src/utility/timeline-date-separate.ts
index e1bc9790b9..ef946b11d6 100644
--- a/packages/frontend/src/utility/timeline-date-separate.ts
+++ b/packages/frontend/src/utility/timeline-date-separate.ts
@@ -4,7 +4,7 @@
  */
 
 import { computed } from 'vue';
-import type { Ref } from 'vue';
+import type { Ref, ComputedRef } from 'vue';
 
 export function getDateText(dateInstance: Date) {
 	const date = dateInstance.getDate();
@@ -25,7 +25,7 @@ export type DateSeparetedTimelineItem<T> = {
 	nextText: string;
 };
 
-export function makeDateSeparatedTimelineComputedRef<T extends { id: string; createdAt: string; }>(items: Ref<T[]>) {
+export function makeDateSeparatedTimelineComputedRef<T extends { id: string; createdAt: string; }>(items: Ref<T[]> | ComputedRef<T[]>) {
 	return computed<DateSeparetedTimelineItem<T>[]>(() => {
 		const tl: DateSeparetedTimelineItem<T>[] = [];
 		for (let i = 0; i < items.value.length; i++) {