Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

webapp/channels/src/selectors/posts.ts

@@ -0,0 +1,54 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import {createSelector} from 'reselect';
+
+import {Post} from '@mattermost/types/posts';
+
+import {getPost} from 'mattermost-redux/selectors/entities/posts';
+import {getCurrentUserId} from 'mattermost-redux/selectors/entities/users';
+
+import {getGlobalItem} from 'selectors/storage';
+import {arePreviewsCollapsed} from 'selectors/preferences';
+import {StoragePrefixes} from 'utils/constants';
+
+import type {GlobalState} from 'types/store';
+
+export function getIsPostBeingEdited(state: GlobalState, postId: string) {
+    return state.views.posts.editingPost.postId === postId && state.views.posts.editingPost.show;
+}
+export function getIsPostBeingEditedInRHS(state: GlobalState, postId: string) {
+    const editingPost = getEditingPost(state);
+
+    return editingPost.isRHS && editingPost.postId === postId && state.views.posts.editingPost.show;
+}
+
+export function getPostEditHistory(state: GlobalState): Post[] {
+    return state.entities.posts.postEditHistory;
+}
+
+export const getEditingPost = createSelector(
+    'getEditingPost',
+    (state: GlobalState) => state.views.posts.editingPost,
+    (state: GlobalState) => getPost(state, state.views.posts.editingPost.postId),
+    (editingPost, post) => {
+        return {
+            ...editingPost,
+            post,
+        };
+    },
+);
+
+export function isEmbedVisible(state: GlobalState, postId: string) {
+    const currentUserId = getCurrentUserId(state);
+    const previewCollapsed = arePreviewsCollapsed(state);
+
+    return getGlobalItem(state, StoragePrefixes.EMBED_VISIBLE + currentUserId + '_' + postId, !previewCollapsed);
+}
+
+export function isInlineImageVisible(state: GlobalState, postId: string, imageKey: string) {
+    const currentUserId = getCurrentUserId(state);
+    const imageCollapsed = arePreviewsCollapsed(state);
+
+    return getGlobalItem(state, StoragePrefixes.INLINE_IMAGE_VISIBLE + currentUserId + '_' + postId + '_' + imageKey, !imageCollapsed);
+}