Don't reset scroll position when opening a modal

app/javascript/flavours/glitch/features/community_timeline/index.js

@@ -71,6 +71,10 @@ export default class CommunityTimeline extends React.PureComponent {
     this.props.dispatch(expandCommunityTimeline({ maxId }));
   }
 
+  shouldUpdateScroll = (prevRouterProps, { location }) => {
+    return !(location.state && location.state.mastodonModalOpen)
+  }
+
   render () {
     const { intl, hasUnread, columnId, multiColumn } = this.props;
     const pinned = !!columnId;
@@ -93,6 +97,7 @@ export default class CommunityTimeline extends React.PureComponent {
         <StatusListContainer
           trackScroll={!pinned}
           scrollKey={`community_timeline-${columnId}`}
+          shouldUpdateScroll={this.shouldUpdateScroll}
           timelineId='community'
           onLoadMore={this.handleLoadMore}
           emptyMessage={<FormattedMessage id='empty_column.community' defaultMessage='The local timeline is empty. Write something publicly to get the ball rolling!' />}