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/client/browser_web_client.jsx

@@ -137,6 +137,17 @@ class WebClientClass extends Client {
             return success(res.body);
         });
     }
+
+    uploadFileV4(file, filename, channelId, clientId, success, error) {
+        return request.
+            post(`${this.url}/api/v4/files`).
+            set(this.defaultHeaders).
+            attach('files', file, filename).
+            field('channel_id', channelId).
+            field('client_ids', clientId).
+            accept('application/json').
+            end(this.handleResponse.bind(this, 'uploadFile', success, error));
+    }
 }
 
 var WebClient = new WebClientClass();