[MM-63685] Virtualize drafts in the drafts list (#30563)

2025-04-23 11:38:04 +05:30
--- a/e2e-tests/playwright/lib/src/ui/pages/drafts.ts
+++ b/e2e-tests/playwright/lib/src/ui/pages/drafts.ts
@@ -6,7 +6,7 @@ import {Page, expect} from '@playwright/test';
 export default class DraftPage {
    readonly page: Page;

-    readonly badgeCountOnScheduledTab;
+    readonly tab;
    readonly confirmbutton;
    readonly datePattern;
    readonly deleteIcon;
@@ -27,8 +27,7 @@ export default class DraftPage {

        this.datePattern =
            /(Today|Tomorrow|(?:January|February|March|April|May|June|July|August|September|October|November|December) \d{1,2}) at \d{1,2}:\d{2} [AP]M/;
-        this.badgeCountOnScheduledTab = page.locator('a#draft_tabs-tab-0 div.drafts_tab_title span.MuiBadge-badge');
-        // this.scheduledDraftPageInfo = page.locator('span:has-text("Send on")');
+        this.tab = page.getByRole('tab', {name: 'Drafts'});
        this.scheduledDraftPageInfo = page.locator('.PanelHeader__info');
        this.scheduledDraftPanel = (messageContent: string) =>
            page.locator(`article.Panel:has(div.post__body:has-text("${messageContent}"))`);
@@ -51,8 +50,10 @@ export default class DraftPage {
    }

    async assertBadgeCountOnTab(badgeCount: string) {
-        await this.badgeCountOnScheduledTab.isVisible();
-        await expect(this.badgeCountOnScheduledTab).toHaveText(badgeCount);
+        await this.tab.isVisible();
+        const badge = this.tab.locator('span.MuiBadge-badge');
+        await expect(badge).toBeVisible();
+        await expect(badge).toHaveText(badgeCount);
    }

    async assertDraftBody(draftMessage: string) {
--- a/e2e-tests/playwright/lib/src/ui/pages/scheduled_draft.ts
+++ b/e2e-tests/playwright/lib/src/ui/pages/scheduled_draft.ts
@@ -6,7 +6,7 @@ import {Page, expect} from '@playwright/test';
 export default class ScheduledDraftPage {
    readonly page: Page;

-    readonly badgeCountOnScheduledTab;
+    readonly tab;
    readonly confirmbutton;
    readonly copyIcon;
    readonly copyIconToolTip;
@@ -31,7 +31,7 @@ export default class ScheduledDraftPage {
        this.datePattern =
            /(Today|Tomorrow|(?:January|February|March|April|May|June|July|August|September|October|November|December) \d{1,2}) at \d{1,2}:\d{2} [AP]M/;
        this.scheduledDraftBody = page.locator('div.post__body');
-        this.badgeCountOnScheduledTab = page.locator('a#draft_tabs-tab-1 div.drafts_tab_title span.MuiBadge-badge');
+        this.tab = page.getByRole('tab', {name: 'Scheduled'});
        this.scheduledDraftPageInfo = page.locator('.PanelHeader__info');
        this.scheduledDraftPanel = (messageContent: string) =>
            page.locator(`article.Panel:has(div.post__body:has-text("${messageContent}"))`);
@@ -56,8 +56,10 @@ export default class ScheduledDraftPage {
    }

    async assertBadgeCountOnTab(badgeCount: string) {
-        await this.badgeCountOnScheduledTab.isVisible();
-        await expect(this.badgeCountOnScheduledTab).toHaveText(badgeCount);
+        await this.tab.isVisible();
+        const badge = this.tab.locator('span.MuiBadge-badge');
+        await expect(badge).toBeVisible();
+        await expect(badge).toHaveText(badgeCount);
    }

    async assertscheduledDraftBody(draftMessage: string) {
--- a/e2e-tests/playwright/specs/visual/channels/intro_channel.spec.ts-snapshots/intro-to-channel-as-regular-user-chrome-linux.png
+++ b/e2e-tests/playwright/specs/visual/channels/intro_channel.spec.ts-snapshots/intro-to-channel-as-regular-user-chrome-linux.png
--- a/e2e-tests/playwright/specs/visual/channels/intro_channel.spec.ts-snapshots/intro-to-channel-as-regular-user-firefox-linux.png
+++ b/e2e-tests/playwright/specs/visual/channels/intro_channel.spec.ts-snapshots/intro-to-channel-as-regular-user-firefox-linux.png
--- a/e2e-tests/playwright/specs/visual/channels/intro_channel.spec.ts-snapshots/intro-to-channel-as-regular-user-ipad-linux.png
+++ b/e2e-tests/playwright/specs/visual/channels/intro_channel.spec.ts-snapshots/intro-to-channel-as-regular-user-ipad-linux.png
--- a/webapp/channels/package.json
+++ b/webapp/channels/package.json
@@ -74,9 +74,9 @@
    "react-router-dom": "5.3.4",
    "react-select": "5.9.0",
    "react-transition-group": "4.4.5",
-    "react-virtualized-auto-sizer": "1.0.7",
-    "react-window": "1.8.8",
-    "react-window-infinite-loader": "1.0.8",
+    "react-virtualized-auto-sizer": "1.0.25",
+    "react-window": "1.8.11",
+    "react-window-infinite-loader": "1.0.10",
    "rebound": "0.1.0",
    "redux": "4.2.0",
    "redux-batched-actions": "0.5.0",
--- a/webapp/channels/src/components/custom_status/custom_status_modal.test.tsx
+++ b/webapp/channels/src/components/custom_status/custom_status_modal.test.tsx
@@ -2,7 +2,7 @@
 // See LICENSE.txt for license information.

 import React from 'react';
-import type {AutoSizerProps} from 'react-virtualized-auto-sizer';
+import type {Props as AutoSizerProps} from 'react-virtualized-auto-sizer';

 import type {DeepPartial} from '@mattermost/types/utilities';

@@ -16,7 +16,7 @@ import type {GlobalState} from 'types/store';

 import CustomStatusModal from './custom_status_modal';

-jest.mock('react-virtualized-auto-sizer', () => (props: AutoSizerProps) => props.children({height: 100, width: 100}));
+jest.mock('react-virtualized-auto-sizer', () => (props: AutoSizerProps) => props.children({height: 100, width: 100, scaledHeight: 100, scaledWidth: 100}));
 jest.mock('images/img_trans.gif', () => 'img_trans.gif');

 describe('CustomStatusModal', () => {
--- a/webapp/channels/src/components/drafts/snapshots/drafts.test.tsx.snap
+++ b/webapp/channels/src/components/drafts/snapshots/drafts.test.tsx.snap
@@ -1,85 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`components/drafts/drafts should match snapshot 1`] = `
-<ContextProvider
-  value={
-    Object {
-      "store": Object {
-        "clearActions": [Function],
-        "dispatch": [Function],
-        "getActions": [Function],
-        "getState": [Function],
-        "replaceReducer": [Function],
-        "subscribe": [Function],
-      },
-      "subscription": Subscription {
-        "handleChangeWrapper": [Function],
-        "listeners": Object {
-          "notify": [Function],
-        },
-        "onStateChange": [Function],
-        "parentSub": undefined,
-        "store": Object {
-          "clearActions": [Function],
-          "dispatch": [Function],
-          "getActions": [Function],
-          "getState": [Function],
-          "replaceReducer": [Function],
-          "subscribe": [Function],
-        },
-        "unsubscribe": null,
-      },
-    }
-  }
->
-  <Memo(Drafts)
-    displayName="display_name"
-    draftRemotes={Object {}}
-    drafts={Array []}
-    status={Object {}}
-    user={Object {}}
-  />
-</ContextProvider>
-`;
-
-exports[`components/drafts/drafts should match snapshot for local drafts disabled 1`] = `
-<ContextProvider
-  value={
-    Object {
-      "store": Object {
-        "clearActions": [Function],
-        "dispatch": [Function],
-        "getActions": [Function],
-        "getState": [Function],
-        "replaceReducer": [Function],
-        "subscribe": [Function],
-      },
-      "subscription": Subscription {
-        "handleChangeWrapper": [Function],
-        "listeners": Object {
-          "notify": [Function],
-        },
-        "onStateChange": [Function],
-        "parentSub": undefined,
-        "store": Object {
-          "clearActions": [Function],
-          "dispatch": [Function],
-          "getActions": [Function],
-          "getState": [Function],
-          "replaceReducer": [Function],
-          "subscribe": [Function],
-        },
-        "unsubscribe": null,
-      },
-    }
-  }
->
-  <Memo(Drafts)
-    displayName="display_name"
-    draftRemotes={Object {}}
-    drafts={Array []}
-    status={Object {}}
-    user={Object {}}
-  />
-</ContextProvider>
-`;
--- a/webapp/channels/src/components/drafts/draft_list/draft_list.tsx
+++ b/webapp/channels/src/components/drafts/draft_list/draft_list.tsx
@@ -1,56 +0,0 @@
-// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
-// See LICENSE.txt for license information.
-
-import classNames from 'classnames';
-import React from 'react';
-import {useIntl} from 'react-intl';
-
-import type {UserProfile, UserStatus} from '@mattermost/types/users';
-
-import type {Draft} from 'selectors/drafts';
-
-import DraftRow from 'components/drafts/draft_row';
-import DraftsIllustration from 'components/drafts/drafts_illustration';
-import NoResultsIndicator from 'components/no_results_indicator';
-
-type Props = {
-    drafts: Draft[];
-    user: UserProfile;
-    displayName: string;
-    draftRemotes: Record<string, boolean>;
-    status: UserStatus['status'];
-    className?: string;
-}
-
-export default function DraftList({drafts, user, displayName, draftRemotes, status, className}: Props) {
-    const {formatMessage} = useIntl();
-
-    return (
-        <div className={classNames('DraftList Drafts__main', className)}>
-            {drafts.map((d) => (
-                <DraftRow
-                    key={d.key}
-                    displayName={displayName}
-                    item={d.value}
-                    isRemote={draftRemotes?.[d.key]}
-                    user={user}
-                    status={status}
-                />
-            ))}
-            {drafts.length === 0 && (
-                <NoResultsIndicator
-                    expanded={true}
-                    iconGraphic={DraftsIllustration}
-                    title={formatMessage({
-                        id: 'drafts.empty.title',
-                        defaultMessage: 'No drafts at the moment',
-                    })}
-                    subtitle={formatMessage({
-                        id: 'drafts.empty.subtitle',
-                        defaultMessage: 'Any messages you’ve started will show here.',
-                    })}
-                />
-            )}
-        </div>
-    );
-}
--- a/webapp/channels/src/components/drafts/draft_list/empty_draft_list.tsx
+++ b/webapp/channels/src/components/drafts/draft_list/empty_draft_list.tsx
@@ -0,0 +1,30 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import React from 'react';
+import {useIntl} from 'react-intl';
+
+import NoResultsIndicator from 'components/no_results_indicator/no_results_indicator';
+
+import EmptyDraftListIllustration from './empty_draft_list_illustration';
+
+export default function EmptyDraftList() {
+    const {formatMessage} = useIntl();
+
+    return (
+        <div className='DraftList Drafts__main'>
+            <NoResultsIndicator
+                expanded={true}
+                iconGraphic={EmptyDraftListIllustration}
+                title={formatMessage({
+                    id: 'drafts.empty.title',
+                    defaultMessage: 'No drafts at the moment',
+                })}
+                subtitle={formatMessage({
+                    id: 'drafts.empty.subtitle',
+                    defaultMessage: 'Any messages you’ve started will show here.',
+                })}
+            />
+        </div>
+    );
+}
--- a/webapp/channels/src/components/drafts/draft_list/empty_draft_list_illustration.tsx
+++ b/webapp/channels/src/components/drafts/draft_list/empty_draft_list_illustration.tsx
--- a/webapp/channels/src/components/drafts/draft_list/index.test.tsx
+++ b/webapp/channels/src/components/drafts/draft_list/index.test.tsx
@@ -0,0 +1,107 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import React from 'react';
+import type {Props as AutoSizerProps} from 'react-virtualized-auto-sizer';
+
+import type {Draft} from 'selectors/drafts';
+
+import {renderWithContext, screen} from 'tests/react_testing_utils';
+import {TestHelper} from 'utils/test_helper';
+
+import type {PostDraft} from 'types/store/draft';
+
+import DraftList from './index';
+
+jest.mock('react-virtualized-auto-sizer', () => (props: AutoSizerProps) => props.children({height: 100, width: 100, scaledHeight: 100, scaledWidth: 100}));
+
+jest.mock('components/drafts/draft_row', () => {
+    return function MockDraftRow(props: {item: PostDraft}) {
+        return (
+            <div
+                data-testid='draft-row'
+                className='draft-row-mock'
+            >
+                {props.item.message}
+            </div>
+        );
+    };
+});
+
+describe('components/drafts/draft_list', () => {
+    const currentUser = TestHelper.getUserMock({id: 'user1'});
+
+    const mockDrafts: Draft[] = [
+        {
+            id: 'channel1',
+            type: 'channel',
+            key: 'draft_channel1',
+            value: TestHelper.getPostDraftMock({
+                message: 'What you seek is seeking you',
+            }),
+            timestamp: new Date(),
+        },
+        {
+            id: 'channel2',
+            type: 'channel',
+            key: 'draft_channel2',
+            value: TestHelper.getPostDraftMock({
+                message: 'Where there is ruin, there is hope for a treasure.',
+            }),
+            timestamp: new Date(),
+        },
+    ];
+
+    const initialState = {
+        views: {
+            drafts: {
+                remotes: {
+                    draft_channel1: false,
+                },
+            },
+        },
+    };
+
+    test('should render empty draft list when no drafts are provided', () => {
+        renderWithContext(
+            <DraftList
+                drafts={[]}
+                currentUser={currentUser}
+                userDisplayName='User One'
+                userStatus='online'
+            />,
+            initialState,
+        );
+
+        expect(screen.getByText('No drafts at the moment')).toBeInTheDocument();
+    });
+
+    test('should handle undefined drafts', () => {
+        renderWithContext(
+            <DraftList
+                drafts={[]}
+                currentUser={currentUser}
+                userDisplayName='User One'
+                userStatus='online'
+            />,
+            initialState,
+        );
+
+        expect(screen.getByText('No drafts at the moment')).toBeInTheDocument();
+    });
+
+    test('should render virtualized draft list when drafts are provided', () => {
+        renderWithContext(
+            <DraftList
+                drafts={mockDrafts}
+                currentUser={currentUser}
+                userDisplayName='User One'
+                userStatus='online'
+            />,
+            initialState,
+        );
+
+        expect(screen.getByText('What you seek is seeking you')).toBeInTheDocument();
+        expect(screen.getByText('Where there is ruin, there is hope for a treasure.')).toBeInTheDocument();
+    });
+});
--- a/webapp/channels/src/components/drafts/draft_list/index.tsx
+++ b/webapp/channels/src/components/drafts/draft_list/index.tsx
@@ -0,0 +1,37 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import React from 'react';
+import {useSelector} from 'react-redux';
+
+import type {UserProfile, UserStatus} from '@mattermost/types/users';
+
+import {getDraftRemotes, type Draft} from 'selectors/drafts';
+
+import EmptyDraftList from './empty_draft_list';
+import VirtualizedDraftList from './virtualized_draft_list';
+
+type Props = {
+    drafts: Draft[];
+    currentUser: UserProfile;
+    userDisplayName: string;
+    userStatus: UserStatus['status'];
+}
+
+export default function DraftList(props: Props) {
+    const draftRemotes = useSelector(getDraftRemotes);
+
+    if (props.drafts.length === 0) {
+        return <EmptyDraftList/>;
+    }
+
+    return (
+        <VirtualizedDraftList
+            drafts={props.drafts}
+            currentUser={props.currentUser}
+            userDisplayName={props.userDisplayName}
+            userStatus={props.userStatus}
+            draftRemotes={draftRemotes}
+        />
+    );
+}
--- a/webapp/channels/src/components/drafts/draft_list/virtualized_draft_list.tsx
+++ b/webapp/channels/src/components/drafts/draft_list/virtualized_draft_list.tsx
@@ -0,0 +1,211 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import classNames from 'classnames';
+import debounce from 'lodash/debounce';
+import type {CSSProperties} from 'react';
+import React, {useMemo, useRef, useCallback, useEffect, memo} from 'react';
+import AutoSizer from 'react-virtualized-auto-sizer';
+import {VariableSizeList} from 'react-window';
+
+import type {UserProfile, UserStatus} from '@mattermost/types/users';
+
+import type {Draft} from 'selectors/drafts';
+
+import DraftRow from 'components/drafts/draft_row';
+
+const OVERSCAN_ROW_COUNT = 6; // no. of rows
+const ROW_HEIGHT_CHANGE_TOLERANCE = 4; // in px
+
+const RESIZE_DEBOUNCE_TIME = 120; // in ms
+
+type Props = {
+    drafts: Draft[];
+    currentUser: UserProfile;
+    userDisplayName: string;
+    userStatus: UserStatus['status'];
+    draftRemotes: Record<string, boolean>;
+}
+
+export default function VirtualizedDraftList(props: Props) {
+    const listRef = useRef<VariableSizeList>(null);
+    const itemHeightCacheMap = useRef<Map<string, number>>(new Map());
+
+    // Function to set row height after measurement, we also reset the list after setting the height
+    const setRowHeight = useCallback((index: number, draftKey: string, size: number) => {
+        const currentItemHeight = itemHeightCacheMap.current.get(draftKey);
+
+        // If current height is not cached or if there is a significant difference, update the cache
+        // This prevents layout thrashing when the height variations are small
+        if (!currentItemHeight || (Math.abs(currentItemHeight - size) > ROW_HEIGHT_CHANGE_TOLERANCE)) {
+            itemHeightCacheMap.current.set(draftKey, size);
+
+            // Reset the list UI in response to the row height changing
+            if (listRef.current) {
+                listRef.current.resetAfterIndex(index);
+            }
+        }
+    }, []);
+
+    const getItemSize = useCallback((index: number) => {
+        const draftKey = index < props.drafts.length ? props.drafts[index].key : '';
+        return draftKey ? (itemHeightCacheMap.current.get(draftKey) || 0) : 0;
+    }, [props.drafts]);
+
+    const itemData = useMemo(() => ({
+        drafts: props.drafts,
+        userDisplayName: props.userDisplayName,
+        draftRemotes: props.draftRemotes,
+        currentUser: props.currentUser,
+        userStatus: props.userStatus,
+        setRowHeight,
+    }), [props.drafts, props.userDisplayName, props.draftRemotes, props.currentUser, props.userStatus, setRowHeight]);
+
+    return (
+        <div className='DraftList Drafts__main'>
+            <AutoSizer>
+                {({height, width}) => (
+                    <VariableSizeList
+                        ref={listRef}
+                        height={height}
+                        width={width}
+                        itemCount={props.drafts.length}
+                        itemSize={getItemSize}
+                        itemData={itemData}
+                        overscanCount={OVERSCAN_ROW_COUNT}
+                    >
+                        {Row}
+                    </VariableSizeList>
+                )}
+            </AutoSizer>
+        </div>
+    );
+}
+
+interface RowProps {
+    index: number;
+    style: CSSProperties;
+    data: {
+        drafts: Draft[];
+        userDisplayName: string;
+        draftRemotes: Record<string, boolean>;
+        currentUser: UserProfile;
+        userStatus: string;
+        setRowHeight: (index: number, draftKey: string, size: number) => void;
+    };
+}
+
+// Row component for dynamic height measurement
+// This component is rendered for each visible draft item by react-window's virtualization
+function RowComponent({index, style, data: {drafts, userDisplayName, draftRemotes, currentUser, userStatus, setRowHeight}}: RowProps) {
+    const draft = drafts[index];
+
+    // Reference to the DOM element we'll measure
+    const rowRef = useRef<HTMLDivElement>(null);
+
+    // These refs store the current values for use in callbacks
+    // This prevents stale closures in the ResizeObserver callback
+    // and ensures event handlers always have the latest values
+    // we also update these refs whenever their source values change
+    const indexRef = useRef(index);
+    const draftKeyRef = useRef(draft.key);
+    const setRowHeightRef = useRef(setRowHeight);
+    useEffect(() => {
+        indexRef.current = index;
+        draftKeyRef.current = draft.key;
+        setRowHeightRef.current = setRowHeight;
+    }, [index, draft.key, setRowHeight]);
+
+    // This effect performs the initial height measurement on first render
+    // or whenever the draft content changes
+    useEffect(() => {
+        if (!rowRef.current) {
+            return undefined;
+        }
+
+        // Use requestAnimationFrame to measure after the browser has painted
+        const rafId = requestAnimationFrame(() => {
+            if (!rowRef.current) {
+                return;
+            }
+
+            const height = rowRef.current.getBoundingClientRect().height;
+
+            // Inform the virtualized list about this row's height
+            setRowHeight(index, draft.key, height);
+        });
+
+        return () => {
+            cancelAnimationFrame(rafId);
+        };
+    }, [draft, setRowHeight, index]);
+
+    // This effect sets up a ResizeObserver to track height changes on the row element
+    useEffect(() => {
+        if (!rowRef.current) {
+            return undefined;
+        }
+
+        // Flag to track whether we're still observing (prevents updates after unmount)
+        let isObservingResize = true;
+
+        // Create a debounced function to update height measurements
+        // This prevents excessive updates when height changes rapidly
+        const debouncedUpdateHeight = debounce((height: number) => {
+            if (!isObservingResize || !rowRef.current) {
+                return;
+            }
+
+            // Notify the parent list about this row's height
+            setRowHeightRef.current(
+                indexRef.current,
+                draftKeyRef.current,
+                height,
+            );
+        }, RESIZE_DEBOUNCE_TIME);
+
+        // This ResizeObserver API notifies us when the element's size changes
+        const resizeObserver = new ResizeObserver((resizeEntries) => {
+            if (!isObservingResize || !rowRef.current) {
+                return;
+            }
+
+            // Since we're observing a single row, we can safely assume that the first entry is the one we want
+            if (resizeEntries.length === 1 && resizeEntries[0].target === rowRef.current) {
+                const height = resizeEntries[0].borderBoxSize[0].blockSize;
+                debouncedUpdateHeight(height);
+            }
+        });
+
+        // Start observing size changes on the row element
+        resizeObserver.observe(rowRef.current);
+
+        return () => {
+            isObservingResize = false;
+            debouncedUpdateHeight.cancel();
+            resizeObserver.disconnect();
+        };
+    }, []);
+
+    return (
+        <div style={style}> {/* To avoid interference with virtualized list styles we are not using this div for height measurement */}
+            <div
+                ref={rowRef}
+                className={classNames('virtualizedVariableListRowWrapper', {
+                    firstRow: index === 0,
+                })}
+            >
+                <DraftRow
+                    key={draft.key}
+                    item={draft.value}
+                    displayName={userDisplayName}
+                    user={currentUser}
+                    status={userStatus}
+                    isRemote={draftRemotes?.[draft.key]}
+                />
+            </div>
+        </div>
+    );
+}
+
+const Row = memo(RowComponent);
--- a/webapp/channels/src/components/drafts/draft_row.scss
+++ b/webapp/channels/src/components/drafts/draft_row.scss
@@ -1,8 +0,0 @@
-// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
-// See LICENSE.txt for license information.
-
-.Panel {
-    .post--editing__wrapper {
-        margin: 16px;
-    }
-}
--- a/webapp/channels/src/components/drafts/draft_row.tsx
+++ b/webapp/channels/src/components/drafts/draft_row.tsx
@@ -50,8 +50,6 @@ import PanelBody from './panel/panel_body';
 import Header from './panel/panel_header';
 import {getErrorStringFromCode} from './utils';

-import './draft_row.scss';
-
 type Props = {
    user: UserProfile;
    status: UserStatus['status'];
@@ -59,6 +57,7 @@ type Props = {
    item: PostDraft | ScheduledPost;
    isRemote?: boolean;
    scrollIntoView?: boolean;
+    containerClassName?: string;
 }

 const mockLastBlurAt = {current: 0};
@@ -70,6 +69,7 @@ function DraftRow({
    displayName,
    isRemote,
    scrollIntoView,
+    containerClassName,
 }: Props) {
    const [isEditing, setIsEditing] = useState(false);

@@ -366,6 +366,7 @@ function DraftRow({
            hasError={Boolean(postError)}
            innerRef={scrollIntoView ? alertRef : undefined}
            isHighlighted={scrollIntoView}
+            className={containerClassName}
        >
            {({hover}) => (
                <>
--- a/webapp/channels/src/components/drafts/drafts.test.tsx
+++ b/webapp/channels/src/components/drafts/drafts.test.tsx
@@ -1,54 +0,0 @@
-// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
-// See LICENSE.txt for license information.
-
-import {shallow} from 'enzyme';
-import React from 'react';
-import {Provider} from 'react-redux';
-
-import type {UserProfile, UserStatus} from '@mattermost/types/users';
-
-import type {Draft} from 'selectors/drafts';
-
-import mockStore from 'tests/test_store';
-
-import Drafts from './drafts';
-
-describe('components/drafts/drafts', () => {
-    const baseProps = {
-        drafts: [] as Draft[],
-        user: {} as UserProfile,
-        displayName: 'display_name',
-        status: {} as UserStatus['status'],
-        draftRemotes: {},
-    };
-
-    it('should match snapshot', () => {
-        const store = mockStore();
-
-        const wrapper = shallow(
-            <Provider store={store}>
-                <Drafts
-                    {...baseProps}
-                />
-            </Provider>,
-        );
-        expect(wrapper).toMatchSnapshot();
-    });
-
-    it('should match snapshot for local drafts disabled', () => {
-        const store = mockStore();
-
-        const props = {
-            ...baseProps,
-        };
-
-        const wrapper = shallow(
-            <Provider store={store}>
-                <Drafts
-                    {...props}
-                />
-            </Provider>,
-        );
-        expect(wrapper).toMatchSnapshot();
-    });
-});
--- a/webapp/channels/src/components/drafts/drafts.tsx
+++ b/webapp/channels/src/components/drafts/drafts.tsx
@@ -1,208 +0,0 @@
-// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
-// See LICENSE.txt for license information.
-
-import {Badge} from '@mui/base';
-import React, {memo, useCallback, useEffect, useMemo} from 'react';
-import {FormattedMessage} from 'react-intl';
-import {useDispatch, useSelector} from 'react-redux';
-import {type match, useHistory, useRouteMatch} from 'react-router-dom';
-
-import type {ScheduledPost} from '@mattermost/types/schedule_post';
-import type {UserProfile, UserStatus} from '@mattermost/types/users';
-
-import {
-    isScheduledPostsEnabled,
-    makeGetScheduledPostsByTeam,
-} from 'mattermost-redux/selectors/entities/scheduled_posts';
-import {getCurrentTeamId} from 'mattermost-redux/selectors/entities/teams';
-
-import {selectLhsItem} from 'actions/views/lhs';
-import {suppressRHS, unsuppressRHS} from 'actions/views/rhs';
-import type {Draft} from 'selectors/drafts';
-
-import DraftList from 'components/drafts/draft_list/draft_list';
-import ScheduledPostList from 'components/drafts/scheduled_post_list/scheduled_post_list';
-import Tab from 'components/tabs/tab';
-import Tabs from 'components/tabs/tabs';
-import Header from 'components/widgets/header';
-
-import {SCHEDULED_POST_URL_SUFFIX} from 'utils/constants';
-
-import type {GlobalState} from 'types/store';
-import {LhsItemType, LhsPage} from 'types/store/lhs';
-
-import './drafts.scss';
-
-const EMPTY_LIST: ScheduledPost[] = [];
-
-type Props = {
-    drafts: Draft[];
-    user: UserProfile;
-    displayName: string;
-    status: UserStatus['status'];
-    draftRemotes: Record<string, boolean>;
-}
-
-function Drafts({
-    displayName,
-    drafts,
-    draftRemotes,
-    status,
-    user,
-}: Props) {
-    const dispatch = useDispatch();
-
-    const history = useHistory();
-    const match: match<{team: string}> = useRouteMatch();
-    const isDraftsTab = useRouteMatch('/:team/drafts');
-
-    const isScheduledPostsTab = useRouteMatch('/:team/' + SCHEDULED_POST_URL_SUFFIX);
-
-    const currentTeamId = useSelector(getCurrentTeamId);
-    const getScheduledPostsByTeam = useMemo(() => makeGetScheduledPostsByTeam(), []);
-    const scheduledPosts = useSelector((state: GlobalState) => getScheduledPostsByTeam(state, currentTeamId, true));
-    const isScheduledPostEnabled = useSelector(isScheduledPostsEnabled);
-
-    useEffect(() => {
-        dispatch(selectLhsItem(LhsItemType.Page, LhsPage.Drafts));
-        dispatch(suppressRHS);
-
-        return () => {
-            dispatch(unsuppressRHS);
-        };
-    }, [dispatch]);
-
-    const handleSwitchTabs = useCallback((key) => {
-        if (key === 0 && isScheduledPostsTab) {
-            history.push(`/${match.params.team}/drafts`);
-        } else if (key === 1 && isDraftsTab) {
-            history.push(`/${match.params.team}/scheduled_posts`);
-        }
-    }, [history, isDraftsTab, isScheduledPostsTab, match]);
-
-    const scheduledPostsTabHeading = useMemo(() => {
-        return (
-            <div className='drafts_tab_title'>
-                <FormattedMessage
-                    id='schedule_post.tab.heading'
-                    defaultMessage='Scheduled'
-                />
-
-                {
-                    scheduledPosts?.length > 0 &&
-                    <Badge
-                        className='badge'
-                        badgeContent={scheduledPosts.length}
-                    />
-                }
-            </div>
-        );
-    }, [scheduledPosts?.length]);
-
-    const draftTabHeading = useMemo(() => {
-        return (
-            <div className='drafts_tab_title'>
-                <FormattedMessage
-                    id='drafts.heading'
-                    defaultMessage='Drafts'
-                />
-
-                {
-                    drafts.length > 0 &&
-                    <Badge
-                        className='badge'
-                        badgeContent={drafts.length}
-                    />
-                }
-            </div>
-        );
-    }, [drafts?.length]);
-
-    const heading = useMemo(() => {
-        return (
-            <FormattedMessage
-                id='drafts.heading'
-                defaultMessage='Drafts'
-            />
-        );
-    }, []);
-
-    const subtitle = useMemo(() => {
-        return (
-            <FormattedMessage
-                id={'drafts.subtitle'}
-                defaultMessage={'Any messages you\'ve started will show here'}
-            />
-        );
-    }, []);
-
-    const activeTab = isDraftsTab ? 0 : 1;
-
-    return (
-        <div
-            id='app-content'
-            className='Drafts app__content'
-        >
-            <Header
-                level={2}
-                className='Drafts__header'
-                heading={heading}
-                subtitle={subtitle}
-            />
-
-            {
-                isScheduledPostEnabled &&
-                <Tabs
-                    id='draft_tabs'
-                    activeKey={activeTab}
-                    mountOnEnter={true}
-                    unmountOnExit={false}
-                    onSelect={handleSwitchTabs}
-                >
-                    <Tab
-                        eventKey={0}
-                        title={draftTabHeading}
-                        unmountOnExit={false}
-                        tabClassName='drafts_tab'
-                        tabIndex={0}
-                    >
-                        <DraftList
-                            drafts={drafts}
-                            user={user}
-                            displayName={displayName}
-                            draftRemotes={draftRemotes}
-                            status={status}
-                        />
-                    </Tab>
-
-                    <Tab
-                        eventKey={1}
-                        title={scheduledPostsTabHeading}
-                        unmountOnExit={false}
-                        tabClassName='drafts_tab'
-                    >
-                        <ScheduledPostList
-                            scheduledPosts={scheduledPosts || EMPTY_LIST}
-                            user={user}
-                            displayName={displayName}
-                            status={status}
-                        />
-                    </Tab>
-                </Tabs>
-            }
-
-            {
-                !isScheduledPostEnabled &&
-                <DraftList
-                    drafts={drafts}
-                    user={user}
-                    displayName={displayName}
-                    draftRemotes={draftRemotes}
-                    status={status}
-                />
-            }
-        </div>
-    );
-}
-
-export default memo(Drafts);
--- a/webapp/channels/src/components/drafts/drafts_and_schedule_posts.scss
+++ b/webapp/channels/src/components/drafts/drafts_and_schedule_posts.scss
@@ -18,9 +18,8 @@
        display: flex;
        overflow: auto;
        width: 100%;
-        height: 100%;
+        height: calc(100% - 56px);
        flex-flow: column nowrap;
-        padding: 24px;
    }

    display: grid;
@@ -72,6 +71,7 @@

            .DraftList.Drafts__main {
                top: 0;
+                height: calc(100%);
            }
        }
    }
@@ -81,6 +81,14 @@
        top: -2px;
    }

+    .virtualizedVariableListRowWrapper {
+        padding: 0 24px 16px 24px;
+
+        &.firstRow {
+            padding-top: 24px;
+        }
+    }
+
    @media screen and (max-width: 768px) {
        grid-template-rows: 0 1fr;

@@ -92,4 +100,11 @@
            border-top: var(--border-default);
        }
    }
+
+    .Panel {
+        .post--editing__wrapper {
+            margin: 16px;
+        }
+    }
+
 }
--- a/webapp/channels/src/components/drafts/drafts_and_schedule_posts_page_header.tsx
+++ b/webapp/channels/src/components/drafts/drafts_and_schedule_posts_page_header.tsx
@@ -0,0 +1,39 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import React from 'react';
+import type {ReactNode} from 'react';
+import {FormattedMessage} from 'react-intl';
+
+import Header from 'components/widgets/header';
+
+type Props = {
+    children: ReactNode;
+}
+
+export default function DraftsAndSchedulePostsPageHeader(props: Props) {
+    return (
+        <div
+            id='app-content'
+            className='Drafts app__content'
+        >
+            <Header
+                level={2}
+                className='Drafts__header'
+                heading={
+                    <FormattedMessage
+                        id='drafts.heading'
+                        defaultMessage='Drafts'
+                    />
+                }
+                subtitle={
+                    <FormattedMessage
+                        id='drafts.subtitle'
+                        defaultMessage="Any messages you've started will show here"
+                    />
+                }
+            />
+            {props.children}
+        </div>
+    );
+}
--- a/webapp/channels/src/components/drafts/drafts_and_schedule_posts_tabs.tsx
+++ b/webapp/channels/src/components/drafts/drafts_and_schedule_posts_tabs.tsx
@@ -0,0 +1,143 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import {Badge} from '@mui/base';
+import React, {useCallback, useMemo} from 'react';
+import {FormattedMessage} from 'react-intl';
+import {useSelector} from 'react-redux';
+import {useHistory, useLocation} from 'react-router-dom';
+
+import type {ScheduledPost} from '@mattermost/types/schedule_post';
+import type {UserProfile, UserStatus} from '@mattermost/types/users';
+
+import {makeGetScheduledPostsByTeam} from 'mattermost-redux/selectors/entities/scheduled_posts';
+import {getCurrentTeam} from 'mattermost-redux/selectors/entities/teams';
+
+import {type Draft} from 'selectors/drafts';
+
+import DraftList from 'components/drafts/draft_list';
+import ScheduledPostList from 'components/drafts/scheduled_post_list';
+import Tab from 'components/tabs/tab';
+import Tabs from 'components/tabs/tabs';
+
+import {DRAFT_URL_SUFFIX, SCHEDULED_POST_URL_SUFFIX} from 'utils/constants';
+
+import type {GlobalState} from 'types/store';
+
+const EMPTY_SCHEDULED_POSTS: ScheduledPost[] = [];
+
+const TAB_KEYS = {
+    DRAFTS: 'drafts',
+    SCHEDULED_POSTS: 'scheduled_posts',
+};
+
+type Props = {
+    drafts: Draft[];
+    currentUser: UserProfile;
+    userDisplayName: string;
+    userStatus: UserStatus['status'];
+}
+
+export default function DraftsAndSchedulePostsTabs(props: Props) {
+    const history = useHistory();
+    const location = useLocation();
+    const isDraftsTab = location.pathname.includes(DRAFT_URL_SUFFIX);
+    const isScheduledPostsTab = location.pathname.includes(SCHEDULED_POST_URL_SUFFIX);
+
+    const currentTeam = useSelector(getCurrentTeam);
+    const currentTeamName = currentTeam?.name ?? '';
+    const currentTeamId = currentTeam?.id ?? '';
+
+    const getScheduledPostsByTeam = useMemo(() => makeGetScheduledPostsByTeam(), []);
+    const scheduledPosts = useSelector((state: GlobalState) => getScheduledPostsByTeam(state, currentTeamId, true));
+
+    const handleSwitchTabs = useCallback((key) => {
+        if (key === TAB_KEYS.DRAFTS) {
+            history.push(`/${currentTeamName}/drafts`);
+        } else if (key === TAB_KEYS.SCHEDULED_POSTS) {
+            history.push(`/${currentTeamName}/scheduled_posts`);
+        }
+    }, [history, currentTeamName]);
+
+    const scheduledPostsTabHeading = useMemo(() => {
+        return (
+            <div className='drafts_tab_title'>
+                <FormattedMessage
+                    id='schedule_post.tab.heading'
+                    defaultMessage='Scheduled'
+                />
+                {scheduledPosts?.length > 0 && (
+                    <Badge
+                        className='badge'
+                        badgeContent={scheduledPosts.length}
+                    />
+                )}
+            </div>
+        );
+    }, [scheduledPosts?.length]);
+
+    const draftTabHeading = useMemo(() => {
+        return (
+            <div className='drafts_tab_title'>
+                <FormattedMessage
+                    id='drafts.heading'
+                    defaultMessage='Drafts'
+                />
+                {props.drafts.length > 0 && (
+                    <Badge
+                        className='badge'
+                        badgeContent={props.drafts.length}
+                    />
+                )}
+            </div>
+        );
+    }, [props.drafts.length]);
+
+    const activeTab = useMemo(() => {
+        if (isDraftsTab) {
+            return TAB_KEYS.DRAFTS;
+        } else if (isScheduledPostsTab) {
+            return TAB_KEYS.SCHEDULED_POSTS;
+        }
+        return '';
+    }, [isDraftsTab, isScheduledPostsTab]);
+
+    return (
+        <Tabs
+            id='draft_tabs'
+            activeKey={activeTab}
+            mountOnEnter={true}
+            unmountOnExit={true}
+            onSelect={handleSwitchTabs}
+        >
+            <Tab
+                eventKey={TAB_KEYS.DRAFTS}
+                title={draftTabHeading}
+                unmountOnExit={true}
+                tabClassName='drafts_tab'
+                tabIndex={0}
+            >
+                <DraftList
+                    drafts={props.drafts}
+                    currentUser={props.currentUser}
+                    userDisplayName={props.userDisplayName}
+                    userStatus={props.userStatus}
+                />
+            </Tab>
+            <Tab
+                eventKey={TAB_KEYS.SCHEDULED_POSTS}
+                title={scheduledPostsTabHeading}
+                unmountOnExit={true}
+                tabClassName='drafts_tab'
+            >
+                <ScheduledPostList
+                    scheduledPosts={scheduledPosts || EMPTY_SCHEDULED_POSTS}
+                    currentUser={props.currentUser}
+                    userDisplayName={props.userDisplayName}
+                    userStatus={props.userStatus}
+                />
+            </Tab>
+        </Tabs>
+    );
+}
+
--- a/webapp/channels/src/components/drafts/index.ts
+++ b/webapp/channels/src/components/drafts/index.ts
@@ -1,32 +0,0 @@
-// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
-// See LICENSE.txt for license information.
-
-import {connect} from 'react-redux';
-
-import {getTeammateNameDisplaySetting} from 'mattermost-redux/selectors/entities/preferences';
-import {getCurrentUser, getStatusForUserId} from 'mattermost-redux/selectors/entities/users';
-import {displayUsername} from 'mattermost-redux/utils/user_utils';
-
-import {makeGetDrafts} from 'selectors/drafts';
-
-import type {GlobalState} from 'types/store';
-
-import Drafts from './drafts';
-
-function makeMapStateToProps() {
-    const getDrafts = makeGetDrafts();
-    return (state: GlobalState) => {
-        const user = getCurrentUser(state);
-        const status = getStatusForUserId(state, user.id);
-
-        return {
-            displayName: displayUsername(user, getTeammateNameDisplaySetting(state)),
-            drafts: getDrafts(state),
-            draftRemotes: state.views.drafts.remotes,
-            status,
-            user,
-        };
-    };
-}
-
-export default connect(makeMapStateToProps)(Drafts);
--- a/webapp/channels/src/components/drafts/index.tsx
+++ b/webapp/channels/src/components/drafts/index.tsx
@@ -0,0 +1,81 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import React, {memo, useEffect, useMemo} from 'react';
+import {useDispatch, useSelector} from 'react-redux';
+
+import {getCurrentUser} from 'mattermost-redux/selectors/entities/common';
+import {getTeammateNameDisplaySetting} from 'mattermost-redux/selectors/entities/preferences';
+import {isScheduledPostsEnabled} from 'mattermost-redux/selectors/entities/scheduled_posts';
+import {getStatusForUserId} from 'mattermost-redux/selectors/entities/users';
+import {displayUsername} from 'mattermost-redux/utils/user_utils';
+
+import {selectLhsItem} from 'actions/views/lhs';
+import {suppressRHS, unsuppressRHS} from 'actions/views/rhs';
+import type {Draft} from 'selectors/drafts';
+import {makeGetDrafts} from 'selectors/drafts';
+
+import DraftList from 'components/drafts/draft_list';
+
+import type {GlobalState} from 'types/store';
+import {LhsItemType, LhsPage} from 'types/store/lhs';
+
+import DraftsAndSchedulePostsPageHeader from './drafts_and_schedule_posts_page_header';
+import DraftsAndSchedulePostsTabs from './drafts_and_schedule_posts_tabs';
+
+import './drafts_and_schedule_posts.scss';
+
+const EMPTY_DRAFTS: Draft[] = [];
+
+function Drafts() {
+    const dispatch = useDispatch();
+
+    const scheduledPostsEnabled = useSelector(isScheduledPostsEnabled);
+
+    // We would need to get drafts here early since its needed by the draft list component
+    const getDrafts = useMemo(() => makeGetDrafts(), []);
+    const drafts = useSelector(getDrafts);
+
+    const currentUser = useSelector(getCurrentUser);
+    const userStatus = useSelector((state: GlobalState) => getStatusForUserId(state, currentUser.id));
+
+    const teammateNameDisplaySetting = useSelector(getTeammateNameDisplaySetting);
+    const userDisplayName = useMemo(() => displayUsername(currentUser, teammateNameDisplaySetting), [currentUser, teammateNameDisplaySetting]);
+
+    // When Drafts component mounts, select Drafts in the LHS
+    // and suppress the RHS and restore RHS when component unmounts
+    useEffect(() => {
+        dispatch(selectLhsItem(LhsItemType.Page, LhsPage.Drafts));
+        dispatch(suppressRHS);
+
+        return () => {
+            dispatch(unsuppressRHS);
+        };
+    }, [dispatch]);
+
+    if (scheduledPostsEnabled) {
+        return (
+            <DraftsAndSchedulePostsPageHeader>
+                <DraftsAndSchedulePostsTabs
+                    drafts={drafts || EMPTY_DRAFTS}
+                    currentUser={currentUser}
+                    userDisplayName={userDisplayName}
+                    userStatus={userStatus}
+                />
+            </DraftsAndSchedulePostsPageHeader>
+        );
+    }
+
+    return (
+        <DraftsAndSchedulePostsPageHeader>
+            <DraftList
+                drafts={drafts || EMPTY_DRAFTS}
+                currentUser={currentUser}
+                userDisplayName={userDisplayName}
+                userStatus={userStatus}
+            />
+        </DraftsAndSchedulePostsPageHeader>
+    );
+}
+
+export default memo(Drafts);
--- a/webapp/channels/src/components/drafts/panel/panel.tsx
+++ b/webapp/channels/src/components/drafts/panel/panel.tsx
@@ -14,6 +14,8 @@ type Props = {
    hasError: boolean;
    innerRef?: React.Ref<HTMLElement>;
    isHighlighted?: boolean;
+    style?: React.CSSProperties;
+    className?: string;
 };

 const isEligibleForClick = makeIsEligibleForClick('.hljs, code');
@@ -24,6 +26,8 @@ function Panel({
    hasError,
    innerRef,
    isHighlighted,
+    style,
+    className,
 }: Props) {
    const [hover, setHover] = useState(false);

@@ -49,7 +53,9 @@ function Panel({
                    draftError: hasError,
                    highlighted: isHighlighted,
                },
+                className,
            )}
+            style={style}
            onMouseOver={handleMouseOver}
            onClick={handleOnClick}
            onMouseLeave={handleMouseLeave}
--- a/webapp/channels/src/components/drafts/scheduled_post_list/empty_scheduled_post_list.tsx
+++ b/webapp/channels/src/components/drafts/scheduled_post_list/empty_scheduled_post_list.tsx
@@ -0,0 +1,29 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import React from 'react';
+import {useIntl} from 'react-intl';
+
+import NoResultsIndicator from 'components/no_results_indicator';
+
+import NoScheduledPostsIllustration from './empty_scheduled_post_list_illustration';
+
+export default function EmptyScheduledPostList() {
+    const {formatMessage} = useIntl();
+
+    return (
+        <NoResultsIndicator
+            expanded={true}
+            iconGraphic={NoScheduledPostsIllustration}
+            title={formatMessage({
+                id: 'Schedule_post.empty_state.title',
+                defaultMessage: 'No scheduled drafts at the moment',
+            })}
+            subtitle={formatMessage({
+                id: 'Schedule_post.empty_state.subtitle',
+                defaultMessage:
+                    'Schedule drafts to send messages at a later time. Any scheduled drafts will show up here and can be modified after being scheduled.',
+            })}
+        />
+    );
+}
--- a/webapp/channels/src/components/drafts/scheduled_post_list/index.tsx
+++ b/webapp/channels/src/components/drafts/scheduled_post_list/index.tsx
@@ -0,0 +1,60 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import React, {useEffect} from 'react';
+import {useDispatch, useSelector} from 'react-redux';
+
+import type {ScheduledPost} from '@mattermost/types/schedule_post';
+import type {UserProfile, UserStatus} from '@mattermost/types/users';
+
+import {fetchMissingChannels} from 'mattermost-redux/actions/channels';
+import {hasScheduledPostError} from 'mattermost-redux/selectors/entities/scheduled_posts';
+import {getCurrentTeamId} from 'mattermost-redux/selectors/entities/teams';
+
+import type {GlobalState} from 'types/store';
+
+import EmptyScheduledPostList from './empty_scheduled_post_list';
+import NonVirtualizedScheduledPostList from './non_virtualized_scheduled_post_list';
+import ScheduledPostError from './scheduled_post_error';
+
+import './scheduled_post_list.scss';
+
+type Props = {
+    scheduledPosts: ScheduledPost[];
+    currentUser: UserProfile;
+    userDisplayName: string;
+    userStatus: UserStatus['status'];
+};
+
+export default function ScheduledPostList(props: Props) {
+    const dispatch = useDispatch();
+
+    const currentTeamId = useSelector(getCurrentTeamId);
+
+    const scheduledPostsHasError = useSelector((state: GlobalState) => hasScheduledPostError(state, currentTeamId));
+
+    useEffect(() => {
+        if (props.scheduledPosts.length > 0) {
+            dispatch(fetchMissingChannels(props.scheduledPosts.map((post) => post.channel_id)));
+        }
+    }, [dispatch, props.scheduledPosts]);
+
+    if (props.scheduledPosts.length === 0) {
+        return (
+            <EmptyScheduledPostList/>
+        );
+    }
+
+    return (
+        <div className='ScheduledPostList nonVirtualizedScheduledPostList'>
+            {scheduledPostsHasError && (<ScheduledPostError/>)}
+
+            <NonVirtualizedScheduledPostList
+                scheduledPosts={props.scheduledPosts}
+                currentUser={props.currentUser}
+                userDisplayName={props.userDisplayName}
+                userStatus={props.userStatus}
+            />
+        </div>
+    );
+}
--- a/webapp/channels/src/components/drafts/scheduled_post_list/non_virtualized_scheduled_post_list.tsx
+++ b/webapp/channels/src/components/drafts/scheduled_post_list/non_virtualized_scheduled_post_list.tsx
@@ -0,0 +1,54 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import classNames from 'classnames';
+import React, {useRef} from 'react';
+
+import type {ScheduledPost} from '@mattermost/types/schedule_post';
+import type {UserProfile, UserStatus} from '@mattermost/types/users';
+
+import DraftRow from 'components/drafts/draft_row';
+
+import {useQuery} from 'utils/http_utils';
+
+type Props = {
+    scheduledPosts: ScheduledPost[];
+    currentUser: UserProfile;
+    userDisplayName: string;
+    userStatus: UserStatus['status'];
+}
+
+export default function NonVirtualizedScheduledPostList(props: Props) {
+    const query = useQuery();
+    const targetId = query.get('target_id');
+    const targetScheduledPostId = useRef<string>();
+
+    return (
+        <>
+            {
+                props.scheduledPosts.map((scheduledPost, index) => {
+                    // find the first scheduled posst with the target and no error
+                    const isInTargetChannelOrThread = scheduledPost.channel_id === targetId || scheduledPost.root_id === targetId;
+                    const hasError = Boolean(scheduledPost.error_code);
+                    const scrollIntoView = !targetScheduledPostId.current && (isInTargetChannelOrThread && !hasError);
+                    if (scrollIntoView) {
+                        // if found, save the scheduled post's ID
+                        targetScheduledPostId.current = scheduledPost.id;
+                    }
+
+                    return (
+                        <DraftRow
+                            key={scheduledPost.id}
+                            item={scheduledPost}
+                            displayName={props.userDisplayName}
+                            status={props.userStatus}
+                            user={props.currentUser}
+                            scrollIntoView={targetScheduledPostId.current === scheduledPost.id} // scroll into view if this is the target scheduled post
+                            containerClassName={classNames('nonVirtualizedScheduledPostRow', {firstRow: index === 0})}
+                        />
+                    );
+                })
+            }
+        </>
+    );
+}
--- a/webapp/channels/src/components/drafts/scheduled_post_list/scheduled_post_error.tsx
+++ b/webapp/channels/src/components/drafts/scheduled_post_list/scheduled_post_error.tsx
@@ -0,0 +1,22 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import React from 'react';
+import {FormattedMessage} from 'react-intl';
+
+import AlertBanner from 'components/alert_banner';
+
+export default function ScheduledPostError() {
+    return (
+        <AlertBanner
+            mode='danger'
+            className='scheduledPostListErrorIndicator'
+            message={
+                <FormattedMessage
+                    id='scheduled_post.panel.error_indicator.message'
+                    defaultMessage='One of your scheduled drafts cannot be sent.'
+                />
+            }
+        />
+    );
+}
--- a/webapp/channels/src/components/drafts/scheduled_post_list/scheduled_post_list.scss
+++ b/webapp/channels/src/components/drafts/scheduled_post_list/scheduled_post_list.scss
@@ -2,17 +2,26 @@
 // See LICENSE.txt for license information.

 .ScheduledPostList {
-    position: absolute;
-    width: 100%;
    height: 100%;
-    padding: 24px;
-    overflow-y: auto;
+
+    &.nonVirtualizedScheduledPostList {
+        position: absolute;
+        overflow-y: auto;
+    }
+
+    .nonVirtualizedScheduledPostRow {
+        margin: 0 24px 16px 24px;
+
+        &.firstRow {
+            margin-top: 24px;
+        }
+    }

    .scheduledPostListErrorIndicator {
        display: flex;
        flex-direction: row;
        align-items: center;
-        margin-bottom: 16px;
+        margin: 24px 24px 16px 24px;
        font-weight: bold;
        padding-block: 10px;
    }
@@ -35,6 +44,4 @@
    .Panel.highlighted {
        animation: borderColorAnimation 10s;
    }
-
-
 }
--- a/webapp/channels/src/components/drafts/scheduled_post_list/scheduled_post_list.tsx
+++ b/webapp/channels/src/components/drafts/scheduled_post_list/scheduled_post_list.tsx
@@ -1,112 +0,0 @@
-// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
-// See LICENSE.txt for license information.
-
-import React, {useEffect, useRef} from 'react';
-import {FormattedMessage, useIntl} from 'react-intl';
-import {useDispatch, useSelector} from 'react-redux';
-
-import type {ScheduledPost} from '@mattermost/types/schedule_post';
-import type {UserProfile, UserStatus} from '@mattermost/types/users';
-
-import {fetchMissingChannels} from 'mattermost-redux/actions/channels';
-import {hasScheduledPostError} from 'mattermost-redux/selectors/entities/scheduled_posts';
-import {getCurrentTeamId} from 'mattermost-redux/selectors/entities/teams';
-
-import AlertBanner from 'components/alert_banner';
-import NoScheduledPostsIllustration from 'components/drafts/scheduled_post_list/empty_scheduled_post_list_illustration';
-import NoResultsIndicator from 'components/no_results_indicator';
-
-import {useQuery} from 'utils/http_utils';
-
-import type {GlobalState} from 'types/store';
-
-import DraftRow from '../draft_row';
-
-import './style.scss';
-
-type Props = {
-    scheduledPosts: ScheduledPost[];
-    user: UserProfile;
-    displayName: string;
-    status: UserStatus['status'];
-}
-
-export default function ScheduledPostList({
-    scheduledPosts,
-    user,
-    displayName,
-    status,
-}: Props) {
-    const {formatMessage} = useIntl();
-
-    const currentTeamId = useSelector(getCurrentTeamId);
-    const scheduledPostsHasError = useSelector((state: GlobalState) => hasScheduledPostError(state, currentTeamId));
-
-    const query = useQuery();
-    const targetId = query.get('target_id');
-    const targetScheduledPostId = useRef<string>();
-
-    const dispatch = useDispatch();
-    useEffect(() => {
-        dispatch(fetchMissingChannels(scheduledPosts.map((post) => post.channel_id)));
-    }, [scheduledPosts]);
-
-    return (
-        <div className='ScheduledPostList'>
-            {
-                scheduledPostsHasError &&
-                <AlertBanner
-                    mode='danger'
-                    className='scheduledPostListErrorIndicator'
-                    message={
-                        <FormattedMessage
-                            id='scheduled_post.panel.error_indicator.message'
-                            defaultMessage='One of your scheduled drafts cannot be sent.'
-                        />
-                    }
-                />
-            }
-
-            {
-                scheduledPosts.map((scheduledPost) => {
-                    // find the first scheduled posst with the target and no error
-                    const isInTargetChannelOrThread = scheduledPost.channel_id === targetId || scheduledPost.root_id === targetId;
-                    const hasError = Boolean(scheduledPost.error_code);
-                    const scrollIntoView = !targetScheduledPostId.current && (isInTargetChannelOrThread && !hasError);
-                    if (scrollIntoView) {
-                        // if found, save the scheduled post's ID
-                        targetScheduledPostId.current = scheduledPost.id;
-                    }
-
-                    return (
-                        <DraftRow
-                            key={scheduledPost.id}
-                            item={scheduledPost}
-                            displayName={displayName}
-                            status={status}
-                            user={user}
-                            scrollIntoView={targetScheduledPostId.current === scheduledPost.id} // scroll into view if this is the target scheduled post
-                        />
-                    );
-                })
-            }
-
-            {
-                scheduledPosts.length === 0 && (
-                    <NoResultsIndicator
-                        expanded={true}
-                        iconGraphic={NoScheduledPostsIllustration}
-                        title={formatMessage({
-                            id: 'Schedule_post.empty_state.title',
-                            defaultMessage: 'No scheduled drafts at the moment',
-                        })}
-                        subtitle={formatMessage({
-                            id: 'Schedule_post.empty_state.subtitle',
-                            defaultMessage: 'Schedule drafts to send messages at a later time. Any scheduled drafts will show up here and can be modified after being scheduled.',
-                        })}
-                    />
-                )
-            }
-        </div>
-    );
-}
--- a/webapp/channels/src/components/drafts/scheduled_post_list/virtualized_scheduled_post_list.tsx
+++ b/webapp/channels/src/components/drafts/scheduled_post_list/virtualized_scheduled_post_list.tsx
@@ -0,0 +1,275 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import classNames from 'classnames';
+import debounce from 'lodash/debounce';
+import type {CSSProperties} from 'react';
+import React, {useMemo, useRef, useCallback, useEffect} from 'react';
+import AutoSizer from 'react-virtualized-auto-sizer';
+import {VariableSizeList} from 'react-window';
+
+import type {ScheduledPost} from '@mattermost/types/schedule_post';
+import type {UserProfile, UserStatus} from '@mattermost/types/users';
+
+import DraftRow from 'components/drafts/draft_row';
+
+import {useQuery} from 'utils/http_utils';
+
+const TARGET_ID_QUERY_PARAM = 'target_id';
+const OVERSCAN_ROW_COUNT = 10; // no. of rows
+const ROW_HEIGHT_CHANGE_TOLERANCE = 2; // in px
+
+const FRAME_RATE = 60; // in Hz
+const RESIZE_DEBOUNCE_TIME = Math.round(1000 / FRAME_RATE); // in ms
+
+type Props = {
+    scheduledPosts: ScheduledPost[];
+    currentUser: UserProfile;
+    userDisplayName: string;
+    userStatus: UserStatus['status'];
+}
+
+export default function ScheduledPostList(props: Props) {
+    const query = useQuery();
+    const scheduledPostTargetId = query.get(TARGET_ID_QUERY_PARAM);
+    const targetScheduledPostId = useRef<string>();
+    const listRef = useRef<VariableSizeList>(null);
+    const itemHeightCacheMap = useRef<Map<string, number>>(new Map());
+
+    // Function to set row height after measurement, we also reset the list after setting the height
+    const setRowHeight = useCallback((index: number, postId: string, size: number) => {
+        const currentItemHeight = itemHeightCacheMap.current.get(postId);
+
+        // If current height is not cached or if there is a significant difference, update the cache
+        // This prevents layout thrashing when the height variations are small
+        if (!currentItemHeight || Math.abs(currentItemHeight - size) > ROW_HEIGHT_CHANGE_TOLERANCE) {
+            itemHeightCacheMap.current.set(postId, size);
+
+            // Reset the list UI in response to the row height changing
+            if (listRef.current) {
+                listRef.current.resetAfterIndex(index);
+            }
+        }
+    }, []);
+
+    const getItemSize = useCallback((index: number) => {
+        const postId = index < props.scheduledPosts.length ? props.scheduledPosts[index].id : '';
+        return postId ? (itemHeightCacheMap.current.get(postId) || 0) : 0;
+    }, [props.scheduledPosts]);
+
+    // Update cached sizes when list items change
+    useEffect(() => {
+        if (itemHeightCacheMap.current.size > 0) {
+            const updatedItemHeightCacheMap = new Map<string, number>();
+
+            // Only keep height entries for items that still exist
+            for (const post of props.scheduledPosts) {
+                const height = itemHeightCacheMap.current.get(post.id);
+                if (height) {
+                    updatedItemHeightCacheMap.set(post.id, height);
+                }
+            }
+
+            // Replace the old height cache with the new one
+            itemHeightCacheMap.current = updatedItemHeightCacheMap;
+        }
+
+        // Reset list UI in response to list items changing
+        if (listRef.current) {
+            listRef.current.resetAfterIndex(0);
+        }
+    }, [props.scheduledPosts]);
+
+    // Find the target post index for scrolling
+    useEffect(() => {
+        if (!scheduledPostTargetId || !listRef.current) {
+            return;
+        }
+
+        // Find the target post index
+        const targetIndex = props.scheduledPosts.findIndex((post) => {
+            const isInTargetChannelOrThread = post.channel_id === scheduledPostTargetId || post.root_id === scheduledPostTargetId;
+            const hasError = Boolean(post.error_code);
+            return isInTargetChannelOrThread && !hasError && !targetScheduledPostId.current;
+        });
+
+        if (targetIndex !== -1) {
+            targetScheduledPostId.current = props.scheduledPosts[targetIndex].id;
+            listRef.current.scrollToItem(targetIndex, 'center');
+        }
+    }, [props.scheduledPosts, scheduledPostTargetId]);
+
+    const itemData = useMemo(() => ({
+        scheduledPosts: props.scheduledPosts,
+        userDisplayName: props.userDisplayName,
+        currentUser: props.currentUser,
+        userStatus: props.userStatus,
+        setRowHeight,
+        targetScheduledPostId: targetScheduledPostId.current,
+        scheduledPostTargetId,
+    }), [props.scheduledPosts, props.userDisplayName, props.currentUser, props.userStatus, setRowHeight, scheduledPostTargetId]);
+
+    return (
+        <AutoSizer>
+            {({height, width}) => (
+                <VariableSizeList
+                    ref={listRef}
+                    height={height}
+                    width={width}
+                    itemCount={props.scheduledPosts.length}
+                    itemSize={getItemSize}
+                    itemData={itemData}
+                    overscanCount={OVERSCAN_ROW_COUNT}
+                >
+                    {Row}
+                </VariableSizeList>
+            )}
+        </AutoSizer>
+    );
+}
+
+interface RowProps {
+    index: number;
+    style: CSSProperties;
+    data: {
+        scheduledPosts: ScheduledPost[];
+        userDisplayName: string;
+        currentUser: UserProfile;
+        userStatus: string;
+        setRowHeight: (index: number, postId: string, size: number) => void;
+        targetScheduledPostId?: string;
+        scheduledPostTargetId?: string | null;
+    };
+}
+
+// Row component for dynamic height measurement
+function Row({index, style, data: {scheduledPosts, userDisplayName, currentUser, userStatus, setRowHeight, targetScheduledPostId, scheduledPostTargetId}}: RowProps) {
+    const scheduledPost = scheduledPosts[index];
+
+    // Reference to the DOM element we'll measure
+    const rowRef = useRef<HTMLDivElement>(null);
+
+    // Cache the last measured height to avoid unnecessary updates
+    const lastMeasuredHeightRef = useRef<number | null>(null);
+
+    // These refs store the current values for use in callbacks
+    const indexRef = useRef(index);
+    const postIdRef = useRef(scheduledPost.id);
+    const setRowHeightRef = useRef(setRowHeight);
+    useEffect(() => {
+        indexRef.current = index;
+        postIdRef.current = scheduledPost.id;
+        setRowHeightRef.current = setRowHeight;
+    }, [index, scheduledPost.id, setRowHeight]);
+
+    // Calculate if this row should scroll into view
+    const isInTargetChannelOrThread = scheduledPost.channel_id === scheduledPostTargetId || scheduledPost.root_id === scheduledPostTargetId;
+    const hasError = Boolean(scheduledPost.error_code);
+    const scrollIntoView = targetScheduledPostId === scheduledPost.id || (isInTargetChannelOrThread && !hasError && !targetScheduledPostId);
+
+    // This effect performs the initial height measurement on first render
+    useEffect(() => {
+        if (!rowRef.current) {
+            return undefined;
+        }
+
+        // Use requestAnimationFrame to measure after the browser has painted
+        const rafId = requestAnimationFrame(() => {
+            if (!rowRef.current) {
+                return;
+            }
+
+            // Get the rendered height and enforce minimum height
+            const height = Math.max(rowRef.current.getBoundingClientRect().height);
+            lastMeasuredHeightRef.current = height;
+
+            // Inform the virtualized list about this row's height
+            setRowHeight(index, scheduledPost.id, height);
+        });
+
+        return () => {
+            cancelAnimationFrame(rafId);
+        };
+    }, [scheduledPost, setRowHeight, index, scheduledPost.id]);
+
+    // This effect sets up a ResizeObserver to track height changes on the row element
+    useEffect(() => {
+        if (!rowRef.current) {
+            return undefined;
+        }
+
+        // Flag to track whether we're still observing (prevents updates after unmount)
+        let isObservingResize = true;
+
+        // Create a debounced function to update height measurements
+        const debouncedUpdateHeight = debounce((height: number) => {
+            // Skip if component was unmounted or ref is gone
+            if (!isObservingResize || !rowRef.current) {
+                return;
+            }
+
+            // Skip if the height hasn't changed significantly
+            if (lastMeasuredHeightRef.current !== null && Math.abs((lastMeasuredHeightRef.current - height)) <= ROW_HEIGHT_CHANGE_TOLERANCE) {
+                return;
+            }
+
+            // Update our cached height
+            lastMeasuredHeightRef.current = height;
+
+            // Notify the parent list about the new height
+            setRowHeightRef.current(
+                indexRef.current,
+                postIdRef.current,
+                height,
+            );
+        }, RESIZE_DEBOUNCE_TIME);
+
+        // This ResizeObserver API notifies us when the element's size changes
+        const resizeObserver = new ResizeObserver((entries) => {
+            if (!isObservingResize || !rowRef.current) {
+                return;
+            }
+
+            // Process all resize entries (typically just one)
+            for (const entry of entries) {
+                // Double-check that the entry is for our element
+                if (entry.target === rowRef.current) {
+                    // Get the new content height and enforce minimum
+                    const height = entry.borderBoxSize[0].blockSize;
+
+                    // Update height with debouncing to prevent layout thrashing
+                    debouncedUpdateHeight(height);
+                }
+            }
+        });
+
+        // Start observing size changes on the row element
+        resizeObserver.observe(rowRef.current);
+
+        return () => {
+            isObservingResize = false;
+            debouncedUpdateHeight.cancel();
+            resizeObserver.disconnect();
+        };
+    }, []);
+
+    return (
+        <div style={style}>
+            <div
+                ref={rowRef}
+                className={classNames('virtualizedVariableListRowWrapper', {
+                    firstRow: index === 0,
+                })}
+            >
+                <DraftRow
+                    key={scheduledPost.id}
+                    item={scheduledPost}
+                    displayName={userDisplayName}
+                    user={currentUser}
+                    status={userStatus}
+                    scrollIntoView={scrollIntoView}
+                />
+            </div>
+        </div>
+    );
+}
--- a/webapp/channels/src/components/emoji_picker/snapshots/emoji_picker.test.tsx.snap
+++ b/webapp/channels/src/components/emoji_picker/snapshots/emoji_picker.test.tsx.snap
@@ -142,20 +142,6 @@ exports[`components/emoji_picker/EmojiPicker should match snapshot 1`] = `
        <div
          style="overflow: visible; height: 0px; width: 0px;"
        />
-        <div
-          class="resize-triggers"
-        >
-          <div
-            class="expand-trigger"
-          >
-            <div
-              style="width: 1px; height: 1px;"
-            />
-          </div>
-          <div
-            class="contract-trigger"
-          />
-        </div>
      </div>
    </div>
    <div
--- a/webapp/channels/src/components/threading/global_threads/thread_list/snapshots/virtualized_thread_list.test.tsx.snap
+++ b/webapp/channels/src/components/threading/global_threads/thread_list/snapshots/virtualized_thread_list.test.tsx.snap
@@ -1,12 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP

 exports[`components/threading/global_threads/thread_list/virtualized_thread_list should match snapshot 1`] = `
-<AutoSizer
-  disableHeight={false}
-  disableWidth={false}
-  onResize={[Function]}
-  style={Object {}}
->
+<AutoSizer>
  <Component />
 </AutoSizer>
 `;
--- a/webapp/channels/src/components/threading/virtualized_thread_viewer/virtualized_thread_viewer.tsx
+++ b/webapp/channels/src/components/threading/virtualized_thread_viewer/virtualized_thread_viewer.tsx
@@ -431,7 +431,7 @@ class ThreadViewerVirtualized extends PureComponent<Props, State> {
                    role='application'
                    aria-label={Utils.localizeMessage({id: 'accessibility.sections.rhsContent', defaultMessage: 'message details complimentary region'})}
                    className='post-right__content a11y__region'
-                    style={{height: '100%'}}
+                    style={{height: '100%', position: 'relative'}}
                    data-a11y-sort-order='3'
                    data-a11y-focus-child={true}
                    data-a11y-order-reversed={true}
--- a/webapp/channels/src/selectors/drafts.ts
+++ b/webapp/channels/src/selectors/drafts.ts
@@ -141,3 +141,7 @@ export function makeGetDraft() {
        },
    );
 }
+
+export function getDraftRemotes(state: GlobalState) {
+    return state.views.drafts.remotes;
+}
--- a/webapp/channels/src/utils/constants.tsx
+++ b/webapp/channels/src/utils/constants.tsx
@@ -2249,6 +2249,7 @@ export const PageLoadContext = {
    RECONNECT: 'reconnect',
 } as const;

+export const DRAFT_URL_SUFFIX = 'drafts';
 export const SCHEDULED_POST_URL_SUFFIX = 'scheduled_posts';

 export const scheduledPosts = {
--- a/webapp/channels/src/utils/http_utils.ts
+++ b/webapp/channels/src/utils/http_utils.ts
@@ -1,8 +1,15 @@
 // Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
 // See LICENSE.txt for license information.

+import {useMemo} from 'react';
 import {useLocation} from 'react-router-dom';

 export function useQuery() {
-    return new URLSearchParams(useLocation().search);
+    const {search} = useLocation();
+
+    const params = useMemo(() => {
+        return new URLSearchParams(search);
+    }, [search]);
+
+    return params;
 }
--- a/webapp/channels/src/utils/performance_telemetry/element_identification.test.tsx
+++ b/webapp/channels/src/utils/performance_telemetry/element_identification.test.tsx
@@ -3,7 +3,7 @@

 import {createMemoryHistory} from 'history';
 import React from 'react';
-import type {AutoSizerProps} from 'react-virtualized-auto-sizer';
+import type {Props as AutoSizerProps} from 'react-virtualized-auto-sizer';

 import {Permissions} from 'mattermost-redux/constants';

@@ -14,7 +14,7 @@ import {TestHelper} from 'utils/test_helper';

 import {identifyElementRegion} from './element_identification';

-jest.mock('react-virtualized-auto-sizer', () => (props: AutoSizerProps) => props.children({height: 100, width: 100}));
+jest.mock('react-virtualized-auto-sizer', () => (props: AutoSizerProps) => props.children({height: 100, width: 100, scaledHeight: 100, scaledWidth: 100}));

 describe('identifyElementRegion', () => {
    test('should be able to identify various elements in the app', async () => {
--- a/webapp/package-lock.json
+++ b/webapp/package-lock.json
@@ -128,9 +128,9 @@
        "react-router-dom": "5.3.4",
        "react-select": "5.9.0",
        "react-transition-group": "4.4.5",
-        "react-virtualized-auto-sizer": "1.0.7",
-        "react-window": "1.8.8",
-        "react-window-infinite-loader": "1.0.8",
+        "react-virtualized-auto-sizer": "1.0.25",
+        "react-window": "1.8.11",
+        "react-window-infinite-loader": "1.0.10",
        "rebound": "0.1.0",
        "redux": "4.2.0",
        "redux-batched-actions": "0.5.0",
@@ -515,6 +515,48 @@
        }
      }
    },
+    "channels/node_modules/react-virtualized-auto-sizer": {
+      "version": "1.0.25",
+      "resolved": "https://registry.npmjs.org/react-virtualized-auto-sizer/-/react-virtualized-auto-sizer-1.0.25.tgz",
+      "integrity": "sha512-YHsksEGDfsHbHuaBVDYwJmcktblcHGafz4ZVuYPQYuSHMUGjpwmUCrAOcvMSGMwwk1eFWj1M/1GwYpNPuyhaBg==",
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