PLT-6215 Major post list refactor (#6501)

* Major post list refactor

* Fix post and thread deletion

* Fix preferences not selecting correctly

* Fix military time displaying

* Fix UP key for editing posts

* Fix ESLint error

* Various fixes and updates per feedback

* Fix for permalink view

* Revert to old scrolling method and various fixes

* Add floating timestamp, new message indicator, scroll arrows

* Update post loading for focus mode and add visibility limit

* Fix pinning posts and a react warning

* Add loading UI updates from Asaad

* Fix refreshing loop

* Temporarily bump post visibility limit

* Update infinite scrolling

* Remove infinite scrolling

webapp/utils/constants.jsx

@@ -87,12 +87,14 @@ export const ActionTypes = keyMirror({
     RECEIVED_EDIT_POST: null,
     RECEIVED_SEARCH: null,
     RECEIVED_SEARCH_TERM: null,
+    SELECT_POST: null,
     RECEIVED_POST_SELECTED: null,
     RECEIVED_MENTION_DATA: null,
     RECEIVED_ADD_MENTION: null,
     RECEIVED_POST_PINNED: null,
     RECEIVED_POST_UNPINNED: null,
-    POST_DRAFT_CHANGED: null,
+    INCREASE_POST_VISIBILITY: null,
+    LOADING_POSTS: null,
 
     RECEIVED_PROFILES: null,
     RECEIVED_PROFILES_IN_TEAM: null,
@@ -309,6 +311,8 @@ export const Constants = {
     ErrorPageTypes,
     ErrorBarTypes,
 
+    MAX_POST_VISIBILITY: 1000000,
+
     IGNORE_POST_TYPES: [PostTypes.JOIN_LEAVE, PostTypes.JOIN_CHANNEL, PostTypes.LEAVE_CHANNEL, PostTypes.REMOVE_FROM_CHANNEL, PostTypes.ADD_TO_CHANNEL, PostTypes.ADD_REMOVE],
 
     PayloadSources: keyMirror({

webapp/utils/utils.jsx

@@ -12,6 +12,7 @@ import Constants from 'utils/constants.jsx';
 var ActionTypes = Constants.ActionTypes;
 import Client from 'client/web_client.jsx';
 import * as UserAgent from 'utils/user_agent.jsx';
+import {Posts} from 'mattermost-redux/constants';
 
 import {browserHistory} from 'react-router/es6';
 import {FormattedMessage} from 'react-intl';
@@ -1194,7 +1195,7 @@ export function clearFileInput(elm) {
 }
 
 export function isPostEphemeral(post) {
-    return post.type === Constants.PostTypes.EPHEMERAL || post.state === Constants.POST_DELETED;
+    return post.type === Constants.PostTypes.EPHEMERAL || post.state === Posts.POST_DELETED;
 }
 
 export function getRootId(post) {