Don't reset scroll position when opening a modal

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

@@ -71,6 +71,10 @@ export default class DirectTimeline extends React.PureComponent {
     this.props.dispatch(expandDirectTimeline({ 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 DirectTimeline extends React.PureComponent {
         <StatusListContainer
           trackScroll={!pinned}
           scrollKey={`direct_timeline-${columnId}`}
+          shouldUpdateScroll={this.shouldUpdateScroll}
           timelineId='direct'
           onLoadMore={this.handleLoadMore}
           emptyMessage={<FormattedMessage id='empty_column.direct' defaultMessage="You don't have any direct messages yet. When you send or receive one, it will show up here." />}