Always display tab navigation on local/federated timeline even when empty (#7663)

Fix #7659

app/javascript/mastodon/components/scrollable_list.js

@@ -25,6 +25,7 @@ export default class ScrollableList extends PureComponent {
     isLoading: PropTypes.bool,
     hasMore: PropTypes.bool,
     prepend: PropTypes.node,
+    alwaysPrepend: PropTypes.bool,
     emptyMessage: PropTypes.node,
     children: PropTypes.node,
   };
@@ -140,7 +141,7 @@ export default class ScrollableList extends PureComponent {
   }
 
   render () {
-    const { children, scrollKey, trackScroll, shouldUpdateScroll, isLoading, hasMore, prepend, emptyMessage, onLoadMore } = this.props;
+    const { children, scrollKey, trackScroll, shouldUpdateScroll, isLoading, hasMore, prepend, alwaysPrepend, emptyMessage, onLoadMore } = this.props;
     const { fullscreen } = this.state;
     const childrenCount = React.Children.count(children);
 
@@ -172,8 +173,12 @@ export default class ScrollableList extends PureComponent {
       );
     } else {
       scrollableArea = (
-        <div className='empty-column-indicator' ref={this.setRef}>
-          {emptyMessage}
+        <div style={{ flex: '1 1 auto', display: 'flex', flexDirection: 'column' }}>
+          {alwaysPrepend && prepend}
+
+          <div className='empty-column-indicator' ref={this.setRef}>
+            {emptyMessage}
+          </div>
         </div>
       );
     }

app/javascript/mastodon/components/status_list.js

@@ -24,6 +24,7 @@ export default class StatusList extends ImmutablePureComponent {
     hasMore: PropTypes.bool,
     prepend: PropTypes.node,
     emptyMessage: PropTypes.node,
+    alwaysPrepend: PropTypes.bool,
   };
 
   static defaultProps = {

app/javascript/mastodon/features/community_timeline/index.js

@@ -127,6 +127,7 @@ export default class CommunityTimeline extends React.PureComponent {
 
         <StatusListContainer
           prepend={headline}
+          alwaysPrepend
           trackScroll={!pinned}
           scrollKey={`community_timeline-${columnId}`}
           timelineId={`community${onlyMedia ? ':media' : ''}`}

app/javascript/mastodon/features/public_timeline/index.js

@@ -127,6 +127,7 @@ export default class PublicTimeline extends React.PureComponent {
 
         <StatusListContainer
           prepend={headline}
+          alwaysPrepend
           timelineId={`public${onlyMedia ? ':media' : ''}`}
           onLoadMore={this.handleLoadMore}
           trackScroll={!pinned}