Fix posts from your own webhook not showing as unread until refresh (#5703)

webapp/stores/channel_store.jsx

@@ -10,7 +10,7 @@ import UserStore from 'stores/user_store.jsx';
 var ChannelUtils;
 var Utils;
 import {ActionTypes, Constants} from 'utils/constants.jsx';
-import {isSystemMessage} from 'utils/post_utils.jsx';
+import {isSystemMessage, isFromWebhook} from 'utils/post_utils.jsx';
 const NotificationPrefs = Constants.NotificationPrefs;
 
 const CHANGE_EVENT = 'change';
@@ -521,7 +521,7 @@ ChannelStore.dispatchToken = AppDispatcher.register((payload) => {
             return;
         }
 
-        if (action.post.user_id === UserStore.getCurrentId() && !isSystemMessage(action.post)) {
+        if (action.post.user_id === UserStore.getCurrentId() && !isSystemMessage(action.post) && !isFromWebhook(action.post)) {
             return;
         }
 

webapp/utils/post_utils.jsx

@@ -12,6 +12,10 @@ export function isSystemMessage(post) {
     return post.type && (post.type.lastIndexOf(Constants.SYSTEM_MESSAGE_PREFIX) === 0);
 }
 
+export function isFromWebhook(post) {
+    return post.props && post.props.from_webhook === 'true';
+}
+
 export function isPostOwner(post) {
     return UserStore.getCurrentId() === post.user_id;
 }