Reverted New Messages indicator in center channel (#2853)

webapp/components/posts_view.jsx

@@ -50,7 +50,6 @@ export default class PostsView extends React.Component {
             centerPosts: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.CHANNEL_DISPLAY_MODE, Preferences.CHANNEL_DISPLAY_MODE_DEFAULT) === Preferences.CHANNEL_DISPLAY_MODE_CENTERED,
             isScrolling: false,
             topPostId: null,
-            showUnreadMessageAlert: false,
             currentUser: UserStore.getCurrentUser(),
             profiles: UserStore.getProfiles()
         };
@@ -409,13 +408,6 @@ export default class PostsView extends React.Component {
         }
     }
     componentWillReceiveProps(nextProps) {
-        if (this.props.postList && this.props.postList.order.length) {
-            if (this.props.postList.order[0] !== nextProps.postList.order[0] && nextProps.scrollType !== PostsView.SCROLL_TYPE_BOTTOM && nextProps.scrollType !== PostsView.SCROLL_TYPE_NEW_MESSAGE && nextProps.postList.posts[nextProps.postList.order[0]].user_id !== nextProps.currentUser.id && this.props.postList.order[1] !== nextProps.postList.order[0]) { // new message from another user and not deleted
-                this.setState({showUnreadMessageAlert: true});
-            } else if (nextProps.scrollType === PostsView.SCROLL_TYPE_BOTTOM) {
-                this.setState({showUnreadMessageAlert: false});
-            }
-        }
         if (!this.props.isActive && nextProps.isActive) {
             this.updateState();
             PreferenceStore.addChangeListener(this.updateState);
@@ -550,18 +542,6 @@ export default class PostsView extends React.Component {
                         </div>
                     </div>
                 </div>
-                <div
-                    className='post-list__new-messages-below'
-                    onClick={this.scrollToBottomAnimated}
-                    hidden={!this.state.showUnreadMessageAlert}
-                >
-                    <i className='fa fa-angle-down'></i>
-                    &nbsp;
-                    <FormattedMessage
-                        id='posts_view.newMsg'
-                        defaultMessage='New Messages'
-                    />
-                </div>
             </div>
         );
     }

webapp/sass/layout/_post.scss

@@ -170,33 +170,6 @@ body.ios {
     }
 }
 
-.post-list__new-messages-below {
-    @include single-transition(bottom .5s cubic-bezier(86, 0, 07, 1));
-    @include opacity(.9);
-    background-color: $black;
-    border-radius: 1em;
-    bottom: 10px;
-    color: $white;
-    cursor: pointer;
-    display: inline-block;
-    left: 50%;
-    padding: .3em .75em;
-    position: absolute;
-    transform: translateX(-50%);
-
-    &[hidden] {
-        bottom: -30px;
-    }
-
-    .fa {
-        font-size: 17px;
-        font-weight: bold;
-        margin-right: 1px;
-        position: relative;
-        top: 1px;
-    }
-}
-
 .file-overlay {
     color: $white;
     font-size: em(20px);