Improve modal flow and back button handling (#16499)

* Refactor shouldUpdateScroll passing

So far, shouldUpdateScroll has been manually passed down from the very top of
the React component hierarchy even though it is a static function common to
all ScrollContainer instances, so replaced that with a custom class extending
ScrollContainer.

* Generalize “press back to close modal” to any modal and to public pages

* Fix boost confirmation modal closing media modal

35 files changed, 123 insertions, 200 deletions

diff --git a/app/javascript/mastodon/components/modal_root.js b/app/javascript/mastodon/components/modal_root.js
index 26344528e..8c9409d01 100644
--- a/app/javascript/mastodon/components/modal_root.js
+++ b/app/javascript/mastodon/components/modal_root.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import 'wicg-inert';
+import { createBrowserHistory } from 'history';
 import { multiply } from 'color-blend';
 
 export default class ModalRoot extends React.PureComponent {
@@ -48,6 +49,7 @@ export default class ModalRoot extends React.PureComponent {
   componentDidMount () {
     window.addEventListener('keyup', this.handleKeyUp, false);
     window.addEventListener('keydown', this.handleKeyDown, false);
+    this.history = this.context.router ? this.context.router.history : createBrowserHistory();
   }
 
   componentWillReceiveProps (nextProps) {
@@ -69,6 +71,14 @@ export default class ModalRoot extends React.PureComponent {
         this.activeElement.focus({ preventScroll: true });
         this.activeElement = null;
       }).catch(console.error);
+
+      this._handleModalClose();
+    }
+    if (this.props.children && !prevProps.children) {
+      this._handleModalOpen();
+    }
+    if (this.props.children) {
+      this._ensureHistoryBuffer();
     }
   }
 
@@ -77,6 +87,32 @@ export default class ModalRoot extends React.PureComponent {
     window.removeEventListener('keydown', this.handleKeyDown);
   }
 
+  _handleModalOpen () {
+    this._modalHistoryKey = Date.now();
+    this.unlistenHistory = this.history.listen((_, action) => {
+      if (action === 'POP') {
+        this.props.onClose();
+      }
+    });
+  }
+
+  _handleModalClose () {
+    if (this.unlistenHistory) {
+      this.unlistenHistory();
+    }
+    const { state } = this.history.location;
+    if (state && state.mastodonModalKey === this._modalHistoryKey) {
+      this.history.goBack();
+    }
+  }
+
+  _ensureHistoryBuffer () {
+    const { pathname, state } = this.history.location;
+    if (!state || state.mastodonModalKey !== this._modalHistoryKey) {
+      this.history.push(pathname, { ...state, mastodonModalKey: this._modalHistoryKey });
+    }
+  }
+
   getSiblings = () => {
     return Array(...this.node.parentElement.childNodes).filter(node => node !== this.node);
   }
diff --git a/app/javascript/mastodon/components/scrollable_list.js b/app/javascript/mastodon/components/scrollable_list.js
index 2689b18ef..68a178512 100644
--- a/app/javascript/mastodon/components/scrollable_list.js
+++ b/app/javascript/mastodon/components/scrollable_list.js
@@ -1,5 +1,5 @@
 import React, { PureComponent } from 'react';
-import { ScrollContainer } from 'react-router-scroll-4';
+import ScrollContainer from 'mastodon/containers/scroll_container';
 import PropTypes from 'prop-types';
 import IntersectionObserverArticleContainer from '../containers/intersection_observer_article_container';
 import LoadMore from './load_more';
@@ -34,7 +34,6 @@ class ScrollableList extends PureComponent {
     onScrollToTop: PropTypes.func,
     onScroll: PropTypes.func,
     trackScroll: PropTypes.bool,
-    shouldUpdateScroll: PropTypes.func,
     isLoading: PropTypes.bool,
     showLoading: PropTypes.bool,
     hasMore: PropTypes.bool,
@@ -290,7 +289,7 @@ class ScrollableList extends PureComponent {
   }
 
   render () {
-    const { children, scrollKey, trackScroll, shouldUpdateScroll, showLoading, isLoading, hasMore, numPending, prepend, alwaysPrepend, append, emptyMessage, onLoadMore } = this.props;
+    const { children, scrollKey, trackScroll, showLoading, isLoading, hasMore, numPending, prepend, alwaysPrepend, append, emptyMessage, onLoadMore } = this.props;
     const { fullscreen } = this.state;
     const childrenCount = React.Children.count(children);
 
@@ -356,7 +355,7 @@ class ScrollableList extends PureComponent {
 
     if (trackScroll) {
       return (
-        <ScrollContainer scrollKey={scrollKey} shouldUpdateScroll={shouldUpdateScroll}>
+        <ScrollContainer scrollKey={scrollKey}>
           {scrollableArea}
         </ScrollContainer>
       );
diff --git a/app/javascript/mastodon/components/status_list.js b/app/javascript/mastodon/components/status_list.js
index 25411c127..eaaffcc3a 100644
--- a/app/javascript/mastodon/components/status_list.js
+++ b/app/javascript/mastodon/components/status_list.js
@@ -18,7 +18,6 @@ export default class StatusList extends ImmutablePureComponent {
     onScrollToTop: PropTypes.func,
     onScroll: PropTypes.func,
     trackScroll: PropTypes.bool,
-    shouldUpdateScroll: PropTypes.func,
     isLoading: PropTypes.bool,
     isPartial: PropTypes.bool,
     hasMore: PropTypes.bool,
@@ -77,7 +76,7 @@ export default class StatusList extends ImmutablePureComponent {
   }
 
   render () {
-    const { statusIds, featuredStatusIds, shouldUpdateScroll, onLoadMore, timelineId, ...other }  = this.props;
+    const { statusIds, featuredStatusIds, onLoadMore, timelineId, ...other }  = this.props;
     const { isLoading, isPartial } = other;
 
     if (isPartial) {
@@ -120,7 +119,7 @@ export default class StatusList extends ImmutablePureComponent {
     }
 
     return (
-      <ScrollableList {...other} showLoading={isLoading && statusIds.size === 0} onLoadMore={onLoadMore && this.handleLoadOlder} shouldUpdateScroll={shouldUpdateScroll} ref={this.setRef}>
+      <ScrollableList {...other} showLoading={isLoading && statusIds.size === 0} onLoadMore={onLoadMore && this.handleLoadOlder} ref={this.setRef}>
         {scrollableContent}
       </ScrollableList>
     );
diff --git a/app/javascript/mastodon/containers/mastodon.js b/app/javascript/mastodon/containers/mastodon.js
index 513b59908..892ff1ca9 100644
--- a/app/javascript/mastodon/containers/mastodon.js
+++ b/app/javascript/mastodon/containers/mastodon.js
@@ -10,8 +10,6 @@ import { hydrateStore } from '../actions/store';
 import { connectUserStream } from '../actions/streaming';
 import { IntlProvider, addLocaleData } from 'react-intl';
 import { getLocale } from '../locales';
-import { previewState as previewMediaState } from 'mastodon/features/ui/components/media_modal';
-import { previewState as previewVideoState } from 'mastodon/features/ui/components/video_modal';
 import initialState from '../initial_state';
 import ErrorBoundary from '../components/error_boundary';
 
@@ -41,8 +39,8 @@ export default class Mastodon extends React.PureComponent {
     }
   }
 
-  shouldUpdateScroll (_, { location }) {
-    return location.state !== previewMediaState && location.state !== previewVideoState;
+  shouldUpdateScroll (prevRouterProps, { location }) {
+    return !(location.state?.mastodonModalKey && location.state?.mastodonModalKey !== prevRouterProps?.location?.state?.mastodonModalKey);
   }
 
   render () {
diff --git a/app/javascript/mastodon/containers/scroll_container.js b/app/javascript/mastodon/containers/scroll_container.js
new file mode 100644
index 000000000..d21ff6368
--- /dev/null
+++ b/app/javascript/mastodon/containers/scroll_container.js
@@ -0,0 +1,18 @@
+import { ScrollContainer as OriginalScrollContainer } from 'react-router-scroll-4';
+
+// ScrollContainer is used to automatically scroll to the top when pushing a
+// new history state and remembering the scroll position when going back.
+// There are a few things we need to do differently, though.
+const defaultShouldUpdateScroll = (prevRouterProps, { location }) => {
+  // If the change is caused by opening a modal, do not scroll to top
+  return !(location.state?.mastodonModalKey && location.state?.mastodonModalKey !== prevRouterProps?.location?.state?.mastodonModalKey);
+};
+
+export default
+class ScrollContainer extends OriginalScrollContainer {
+
+  static defaultProps = {
+    shouldUpdateScroll: defaultShouldUpdateScroll,
+  };
+
+}
diff --git a/app/javascript/mastodon/features/account_gallery/index.js b/app/javascript/mastodon/features/account_gallery/index.js
index 015a6a6d7..e199c929e 100644
--- a/app/javascript/mastodon/features/account_gallery/index.js
+++ b/app/javascript/mastodon/features/account_gallery/index.js
@@ -11,7 +11,7 @@ import ImmutablePureComponent from 'react-immutable-pure-component';
 import { getAccountGallery } from 'mastodon/selectors';
 import MediaItem from './components/media_item';
 import HeaderContainer from '../account_timeline/containers/header_container';
-import { ScrollContainer } from 'react-router-scroll-4';
+import ScrollContainer from 'mastodon/containers/scroll_container';
 import LoadMore from 'mastodon/components/load_more';
 import MissingIndicator from 'mastodon/components/missing_indicator';
 import { openModal } from 'mastodon/actions/modal';
@@ -29,7 +29,6 @@ const mapStateToProps = (state, props) => ({
 class LoadMoreMedia extends ImmutablePureComponent {
 
   static propTypes = {
-    shouldUpdateScroll: PropTypes.func,
     maxId: PropTypes.string,
     onLoadMore: PropTypes.func.isRequired,
   };
@@ -127,7 +126,7 @@ class AccountGallery extends ImmutablePureComponent {
   }
 
   render () {
-    const { attachments, shouldUpdateScroll, isLoading, hasMore, isAccount, multiColumn, blockedBy, suspended } = this.props;
+    const { attachments, isLoading, hasMore, isAccount, multiColumn, blockedBy, suspended } = this.props;
     const { width } = this.state;
 
     if (!isAccount) {
@@ -164,7 +163,7 @@ class AccountGallery extends ImmutablePureComponent {
       <Column>
         <ColumnBackButton multiColumn={multiColumn} />
 
-        <ScrollContainer scrollKey='account_gallery' shouldUpdateScroll={shouldUpdateScroll}>
+        <ScrollContainer scrollKey='account_gallery'>
           <div className='scrollable scrollable--flex' onScroll={this.handleScroll}>
             <HeaderContainer accountId={this.props.params.accountId} />
 
diff --git a/app/javascript/mastodon/features/account_timeline/index.js b/app/javascript/mastodon/features/account_timeline/index.js
index fa4239d6f..821c852b6 100644
--- a/app/javascript/mastodon/features/account_timeline/index.js
+++ b/app/javascript/mastodon/features/account_timeline/index.js
@@ -50,7 +50,6 @@ class AccountTimeline extends ImmutablePureComponent {
   static propTypes = {
     params: PropTypes.object.isRequired,
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     statusIds: ImmutablePropTypes.list,
     featuredStatusIds: ImmutablePropTypes.list,
     isLoading: PropTypes.bool,
@@ -115,7 +114,7 @@ class AccountTimeline extends ImmutablePureComponent {
   }
 
   render () {
-    const { shouldUpdateScroll, statusIds, featuredStatusIds, isLoading, hasMore, blockedBy, suspended, isAccount, multiColumn, remote, remoteUrl } = this.props;
+    const { statusIds, featuredStatusIds, isLoading, hasMore, blockedBy, suspended, isAccount, multiColumn, remote, remoteUrl } = this.props;
 
     if (!isAccount) {
       return (
@@ -162,7 +161,6 @@ class AccountTimeline extends ImmutablePureComponent {
           isLoading={isLoading}
           hasMore={hasMore}
           onLoadMore={this.handleLoadMore}
-          shouldUpdateScroll={shouldUpdateScroll}
           emptyMessage={emptyMessage}
           bindToDocument={!multiColumn}
           timelineId='account'
diff --git a/app/javascript/mastodon/features/blocks/index.js b/app/javascript/mastodon/features/blocks/index.js
index 107deb841..7ec177434 100644
--- a/app/javascript/mastodon/features/blocks/index.js
+++ b/app/javascript/mastodon/features/blocks/index.js
@@ -29,7 +29,6 @@ class Blocks extends ImmutablePureComponent {
   static propTypes = {
     params: PropTypes.object.isRequired,
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     accountIds: ImmutablePropTypes.list,
     hasMore: PropTypes.bool,
     isLoading: PropTypes.bool,
@@ -46,7 +45,7 @@ class Blocks extends ImmutablePureComponent {
   }, 300, { leading: true });
 
   render () {
-    const { intl, accountIds, shouldUpdateScroll, hasMore, multiColumn, isLoading } = this.props;
+    const { intl, accountIds, hasMore, multiColumn, isLoading } = this.props;
 
     if (!accountIds) {
       return (
@@ -66,7 +65,6 @@ class Blocks extends ImmutablePureComponent {
           onLoadMore={this.handleLoadMore}
           hasMore={hasMore}
           isLoading={isLoading}
-          shouldUpdateScroll={shouldUpdateScroll}
           emptyMessage={emptyMessage}
           bindToDocument={!multiColumn}
         >
diff --git a/app/javascript/mastodon/features/bookmarked_statuses/index.js b/app/javascript/mastodon/features/bookmarked_statuses/index.js
index c37cb9176..cf067d954 100644
--- a/app/javascript/mastodon/features/bookmarked_statuses/index.js
+++ b/app/javascript/mastodon/features/bookmarked_statuses/index.js
@@ -27,7 +27,6 @@ class Bookmarks extends ImmutablePureComponent {
 
   static propTypes = {
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     statusIds: ImmutablePropTypes.list.isRequired,
     intl: PropTypes.object.isRequired,
     columnId: PropTypes.string,
@@ -68,7 +67,7 @@ class Bookmarks extends ImmutablePureComponent {
   }, 300, { leading: true })
 
   render () {
-    const { intl, shouldUpdateScroll, statusIds, columnId, multiColumn, hasMore, isLoading } = this.props;
+    const { intl, statusIds, columnId, multiColumn, hasMore, isLoading } = this.props;
     const pinned = !!columnId;
 
     const emptyMessage = <FormattedMessage id='empty_column.bookmarked_statuses' defaultMessage="You don't have any bookmarked toots yet. When you bookmark one, it will show up here." />;
@@ -93,7 +92,6 @@ class Bookmarks extends ImmutablePureComponent {
           hasMore={hasMore}
           isLoading={isLoading}
           onLoadMore={this.handleLoadMore}
-          shouldUpdateScroll={shouldUpdateScroll}
           emptyMessage={emptyMessage}
           bindToDocument={!multiColumn}
         />
diff --git a/app/javascript/mastodon/features/community_timeline/index.js b/app/javascript/mastodon/features/community_timeline/index.js
index b3cd39685..30f776048 100644
--- a/app/javascript/mastodon/features/community_timeline/index.js
+++ b/app/javascript/mastodon/features/community_timeline/index.js
@@ -41,7 +41,6 @@ class CommunityTimeline extends React.PureComponent {
 
   static propTypes = {
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     columnId: PropTypes.string,
     intl: PropTypes.object.isRequired,
     hasUnread: PropTypes.bool,
@@ -103,7 +102,7 @@ class CommunityTimeline extends React.PureComponent {
   }
 
   render () {
-    const { intl, shouldUpdateScroll, hasUnread, columnId, multiColumn, onlyMedia } = this.props;
+    const { intl, hasUnread, columnId, multiColumn, onlyMedia } = this.props;
     const pinned = !!columnId;
 
     return (
@@ -127,7 +126,6 @@ class CommunityTimeline extends React.PureComponent {
           timelineId={`community${onlyMedia ? ':media' : ''}`}
           onLoadMore={this.handleLoadMore}
           emptyMessage={<FormattedMessage id='empty_column.community' defaultMessage='The local timeline is empty. Write something publicly to get the ball rolling!' />}
-          shouldUpdateScroll={shouldUpdateScroll}
           bindToDocument={!multiColumn}
         />
       </Column>
diff --git a/app/javascript/mastodon/features/direct_timeline/components/conversations_list.js b/app/javascript/mastodon/features/direct_timeline/components/conversations_list.js
index 4ee8e5212..fd1df7256 100644
--- a/app/javascript/mastodon/features/direct_timeline/components/conversations_list.js
+++ b/app/javascript/mastodon/features/direct_timeline/components/conversations_list.js
@@ -14,7 +14,6 @@ export default class ConversationsList extends ImmutablePureComponent {
     hasMore: PropTypes.bool,
     isLoading: PropTypes.bool,
     onLoadMore: PropTypes.func,
-    shouldUpdateScroll: PropTypes.func,
   };
 
   getCurrentIndex = id => this.props.conversations.findIndex(x => x.get('id') === id)
diff --git a/app/javascript/mastodon/features/direct_timeline/index.js b/app/javascript/mastodon/features/direct_timeline/index.js
index 5ce795760..68523666c 100644
--- a/app/javascript/mastodon/features/direct_timeline/index.js
+++ b/app/javascript/mastodon/features/direct_timeline/index.js
@@ -19,7 +19,6 @@ class DirectTimeline extends React.PureComponent {
 
   static propTypes = {
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     columnId: PropTypes.string,
     intl: PropTypes.object.isRequired,
     hasUnread: PropTypes.bool,
@@ -71,7 +70,7 @@ class DirectTimeline extends React.PureComponent {
   }
 
   render () {
-    const { intl, hasUnread, columnId, multiColumn, shouldUpdateScroll } = this.props;
+    const { intl, hasUnread, columnId, multiColumn } = this.props;
     const pinned = !!columnId;
 
     return (
@@ -93,7 +92,6 @@ class DirectTimeline extends React.PureComponent {
           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." />}
-          shouldUpdateScroll={shouldUpdateScroll}
         />
       </Column>
     );
diff --git a/app/javascript/mastodon/features/directory/index.js b/app/javascript/mastodon/features/directory/index.js
index 2f91e759b..88f20d330 100644
--- a/app/javascript/mastodon/features/directory/index.js
+++ b/app/javascript/mastodon/features/directory/index.js
@@ -12,7 +12,7 @@ import AccountCard from './components/account_card';
 import RadioButton from 'mastodon/components/radio_button';
 import classNames from 'classnames';
 import LoadMore from 'mastodon/components/load_more';
-import { ScrollContainer } from 'react-router-scroll-4';
+import ScrollContainer from 'mastodon/containers/scroll_container';
 
 const messages = defineMessages({
   title: { id: 'column.directory', defaultMessage: 'Browse profiles' },
@@ -40,7 +40,6 @@ class Directory extends React.PureComponent {
     isLoading: PropTypes.bool,
     accountIds: ImmutablePropTypes.list.isRequired,
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     columnId: PropTypes.string,
     intl: PropTypes.object.isRequired,
     multiColumn: PropTypes.bool,
@@ -125,7 +124,7 @@ class Directory extends React.PureComponent {
   }
 
   render () {
-    const { isLoading, accountIds, intl, columnId, multiColumn, domain, shouldUpdateScroll } = this.props;
+    const { isLoading, accountIds, intl, columnId, multiColumn, domain } = this.props;
     const { order, local }  = this.getParams(this.props, this.state);
     const pinned = !!columnId;
 
@@ -163,7 +162,7 @@ class Directory extends React.PureComponent {
           multiColumn={multiColumn}
         />
 
-        {multiColumn && !pinned ? <ScrollContainer scrollKey='directory' shouldUpdateScroll={shouldUpdateScroll}>{scrollableArea}</ScrollContainer> : scrollableArea}
+        {multiColumn && !pinned ? <ScrollContainer scrollKey='directory'>{scrollableArea}</ScrollContainer> : scrollableArea}
       </Column>
     );
   }
diff --git a/app/javascript/mastodon/features/domain_blocks/index.js b/app/javascript/mastodon/features/domain_blocks/index.js
index a6d988912..edb80aef4 100644
--- a/app/javascript/mastodon/features/domain_blocks/index.js
+++ b/app/javascript/mastodon/features/domain_blocks/index.js
@@ -29,7 +29,6 @@ class Blocks extends ImmutablePureComponent {
   static propTypes = {
     params: PropTypes.object.isRequired,
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     hasMore: PropTypes.bool,
     domains: ImmutablePropTypes.orderedSet,
     intl: PropTypes.object.isRequired,
@@ -45,7 +44,7 @@ class Blocks extends ImmutablePureComponent {
   }, 300, { leading: true });
 
   render () {
-    const { intl, domains, shouldUpdateScroll, hasMore, multiColumn } = this.props;
+    const { intl, domains, hasMore, multiColumn } = this.props;
 
     if (!domains) {
       return (
@@ -64,7 +63,6 @@ class Blocks extends ImmutablePureComponent {
           scrollKey='domain_blocks'
           onLoadMore={this.handleLoadMore}
           hasMore={hasMore}
-          shouldUpdateScroll={shouldUpdateScroll}
           emptyMessage={emptyMessage}
           bindToDocument={!multiColumn}
         >
diff --git a/app/javascript/mastodon/features/favourited_statuses/index.js b/app/javascript/mastodon/features/favourited_statuses/index.js
index db8a3f815..9606a144c 100644
--- a/app/javascript/mastodon/features/favourited_statuses/index.js
+++ b/app/javascript/mastodon/features/favourited_statuses/index.js
@@ -27,7 +27,6 @@ class Favourites extends ImmutablePureComponent {
 
   static propTypes = {
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     statusIds: ImmutablePropTypes.list.isRequired,
     intl: PropTypes.object.isRequired,
     columnId: PropTypes.string,
@@ -68,7 +67,7 @@ class Favourites extends ImmutablePureComponent {
   }, 300, { leading: true })
 
   render () {
-    const { intl, shouldUpdateScroll, statusIds, columnId, multiColumn, hasMore, isLoading } = this.props;
+    const { intl, statusIds, columnId, multiColumn, hasMore, isLoading } = this.props;
     const pinned = !!columnId;
 
     const emptyMessage = <FormattedMessage id='empty_column.favourited_statuses' defaultMessage="You don't have any favourite toots yet. When you favourite one, it will show up here." />;
@@ -93,7 +92,6 @@ class Favourites extends ImmutablePureComponent {
           hasMore={hasMore}
           isLoading={isLoading}
           onLoadMore={this.handleLoadMore}
-          shouldUpdateScroll={shouldUpdateScroll}
           emptyMessage={emptyMessage}
           bindToDocument={!multiColumn}
         />
diff --git a/app/javascript/mastodon/features/favourites/index.js b/app/javascript/mastodon/features/favourites/index.js
index 75cb00c0e..ac94ae18a 100644
--- a/app/javascript/mastodon/features/favourites/index.js
+++ b/app/javascript/mastodon/features/favourites/index.js
@@ -27,7 +27,6 @@ class Favourites extends ImmutablePureComponent {
   static propTypes = {
     params: PropTypes.object.isRequired,
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     accountIds: ImmutablePropTypes.list,
     multiColumn: PropTypes.bool,
     intl: PropTypes.object.isRequired,
@@ -50,7 +49,7 @@ class Favourites extends ImmutablePureComponent {
   }
 
   render () {
-    const { intl, shouldUpdateScroll, accountIds, multiColumn } = this.props;
+    const { intl, accountIds, multiColumn } = this.props;
 
     if (!accountIds) {
       return (
@@ -74,7 +73,6 @@ class Favourites extends ImmutablePureComponent {
 
         <ScrollableList
           scrollKey='favourites'
-          shouldUpdateScroll={shouldUpdateScroll}
           emptyMessage={emptyMessage}
           bindToDocument={!multiColumn}
         >
diff --git a/app/javascript/mastodon/features/follow_requests/index.js b/app/javascript/mastodon/features/follow_requests/index.js
index 18df9d25c..1f9b635bb 100644
--- a/app/javascript/mastodon/features/follow_requests/index.js
+++ b/app/javascript/mastodon/features/follow_requests/index.js
@@ -32,7 +32,6 @@ class FollowRequests extends ImmutablePureComponent {
   static propTypes = {
     params: PropTypes.object.isRequired,
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     hasMore: PropTypes.bool,
     isLoading: PropTypes.bool,
     accountIds: ImmutablePropTypes.list,
@@ -51,7 +50,7 @@ class FollowRequests extends ImmutablePureComponent {
   }, 300, { leading: true });
 
   render () {
-    const { intl, shouldUpdateScroll, accountIds, hasMore, multiColumn, locked, domain, isLoading } = this.props;
+    const { intl, accountIds, hasMore, multiColumn, locked, domain, isLoading } = this.props;
 
     if (!accountIds) {
       return (
@@ -80,7 +79,6 @@ class FollowRequests extends ImmutablePureComponent {
           onLoadMore={this.handleLoadMore}
           hasMore={hasMore}
           isLoading={isLoading}
-          shouldUpdateScroll={shouldUpdateScroll}
           emptyMessage={emptyMessage}
           bindToDocument={!multiColumn}
           prepend={unlockedPrependMessage}
diff --git a/app/javascript/mastodon/features/followers/index.js b/app/javascript/mastodon/features/followers/index.js
index ae00d13d3..ee747f0da 100644
--- a/app/javascript/mastodon/features/followers/index.js
+++ b/app/javascript/mastodon/features/followers/index.js
@@ -43,7 +43,6 @@ class Followers extends ImmutablePureComponent {
   static propTypes = {
     params: PropTypes.object.isRequired,
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     accountIds: ImmutablePropTypes.list,
     hasMore: PropTypes.bool,
     isLoading: PropTypes.bool,
@@ -73,7 +72,7 @@ class Followers extends ImmutablePureComponent {
   }, 300, { leading: true });
 
   render () {
-    const { shouldUpdateScroll, accountIds, hasMore, blockedBy, isAccount, multiColumn, isLoading, remote, remoteUrl } = this.props;
+    const { accountIds, hasMore, blockedBy, isAccount, multiColumn, isLoading, remote, remoteUrl } = this.props;
 
     if (!isAccount) {
       return (
@@ -112,7 +111,6 @@ class Followers extends ImmutablePureComponent {
           hasMore={hasMore}
           isLoading={isLoading}
           onLoadMore={this.handleLoadMore}
-          shouldUpdateScroll={shouldUpdateScroll}
           prepend={<HeaderContainer accountId={this.props.params.accountId} hideTabs />}
           alwaysPrepend
           append={remoteMessage}
diff --git a/app/javascript/mastodon/features/following/index.js b/app/javascript/mastodon/features/following/index.js
index 666ec7a7f..804df803e 100644
--- a/app/javascript/mastodon/features/following/index.js
+++ b/app/javascript/mastodon/features/following/index.js
@@ -43,7 +43,6 @@ class Following extends ImmutablePureComponent {
   static propTypes = {
     params: PropTypes.object.isRequired,
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     accountIds: ImmutablePropTypes.list,
     hasMore: PropTypes.bool,
     isLoading: PropTypes.bool,
@@ -73,7 +72,7 @@ class Following extends ImmutablePureComponent {
   }, 300, { leading: true });
 
   render () {
-    const { shouldUpdateScroll, accountIds, hasMore, blockedBy, isAccount, multiColumn, isLoading, remote, remoteUrl } = this.props;
+    const { accountIds, hasMore, blockedBy, isAccount, multiColumn, isLoading, remote, remoteUrl } = this.props;
 
     if (!isAccount) {
       return (
@@ -112,7 +111,6 @@ class Following extends ImmutablePureComponent {
           hasMore={hasMore}
           isLoading={isLoading}
           onLoadMore={this.handleLoadMore}
-          shouldUpdateScroll={shouldUpdateScroll}
           prepend={<HeaderContainer accountId={this.props.params.accountId} hideTabs />}
           alwaysPrepend
           append={remoteMessage}
diff --git a/app/javascript/mastodon/features/hashtag_timeline/index.js b/app/javascript/mastodon/features/hashtag_timeline/index.js
index 5ccd9f8ea..6a808eb30 100644
--- a/app/javascript/mastodon/features/hashtag_timeline/index.js
+++ b/app/javascript/mastodon/features/hashtag_timeline/index.js
@@ -24,7 +24,6 @@ class HashtagTimeline extends React.PureComponent {
     params: PropTypes.object.isRequired,
     columnId: PropTypes.string,
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     hasUnread: PropTypes.bool,
     multiColumn: PropTypes.bool,
   };
@@ -130,7 +129,7 @@ class HashtagTimeline extends React.PureComponent {
   }
 
   render () {
-    const { shouldUpdateScroll, hasUnread, columnId, multiColumn } = this.props;
+    const { hasUnread, columnId, multiColumn } = this.props;
     const { id, local } = this.props.params;
     const pinned = !!columnId;
 
@@ -156,7 +155,6 @@ class HashtagTimeline extends React.PureComponent {
           timelineId={`hashtag:${id}${local ? ':local' : ''}`}
           onLoadMore={this.handleLoadMore}
           emptyMessage={<FormattedMessage id='empty_column.hashtag' defaultMessage='There is nothing in this hashtag yet.' />}
-          shouldUpdateScroll={shouldUpdateScroll}
           bindToDocument={!multiColumn}
         />
       </Column>
diff --git a/app/javascript/mastodon/features/home_timeline/index.js b/app/javascript/mastodon/features/home_timeline/index.js
index b85c69af7..dc440f2fe 100644
--- a/app/javascript/mastodon/features/home_timeline/index.js
+++ b/app/javascript/mastodon/features/home_timeline/index.js
@@ -34,7 +34,6 @@ class HomeTimeline extends React.PureComponent {
 
   static propTypes = {
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     intl: PropTypes.object.isRequired,
     hasUnread: PropTypes.bool,
     isPartial: PropTypes.bool,
@@ -112,7 +111,7 @@ class HomeTimeline extends React.PureComponent {
   }
 
   render () {
-    const { intl, shouldUpdateScroll, hasUnread, columnId, multiColumn, hasAnnouncements, unreadAnnouncements, showAnnouncements } = this.props;
+    const { intl, hasUnread, columnId, multiColumn, hasAnnouncements, unreadAnnouncements, showAnnouncements } = this.props;
     const pinned = !!columnId;
 
     let announcementsButton = null;
@@ -154,7 +153,6 @@ class HomeTimeline extends React.PureComponent {
           onLoadMore={this.handleLoadMore}
           timelineId='home'
           emptyMessage={<FormattedMessage id='empty_column.home' defaultMessage='Your home timeline is empty! Follow more people to fill it up. {suggestions}' values={{ suggestions: <Link to='/start'><FormattedMessage id='empty_column.home.suggestions' defaultMessage='See some suggestions' /></Link> }} />}
-          shouldUpdateScroll={shouldUpdateScroll}
           bindToDocument={!multiColumn}
         />
       </Column>
diff --git a/app/javascript/mastodon/features/list_timeline/index.js b/app/javascript/mastodon/features/list_timeline/index.js
index 8eb645630..8010274f8 100644
--- a/app/javascript/mastodon/features/list_timeline/index.js
+++ b/app/javascript/mastodon/features/list_timeline/index.js
@@ -41,7 +41,6 @@ class ListTimeline extends React.PureComponent {
   static propTypes = {
     params: PropTypes.object.isRequired,
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     columnId: PropTypes.string,
     hasUnread: PropTypes.bool,
     multiColumn: PropTypes.bool,
@@ -142,7 +141,7 @@ class ListTimeline extends React.PureComponent {
   }
 
   render () {
-    const { shouldUpdateScroll, hasUnread, columnId, multiColumn, list, intl } = this.props;
+    const { hasUnread, columnId, multiColumn, list, intl } = this.props;
     const { id } = this.props.params;
     const pinned = !!columnId;
     const title  = list ? list.get('title') : id;
@@ -207,7 +206,6 @@ class ListTimeline extends React.PureComponent {
           timelineId={`list:${id}`}
           onLoadMore={this.handleLoadMore}
           emptyMessage={<FormattedMessage id='empty_column.list' defaultMessage='There is nothing in this list yet. When members of this list post new statuses, they will appear here.' />}
-          shouldUpdateScroll={shouldUpdateScroll}
           bindToDocument={!multiColumn}
         />
       </Column>
diff --git a/app/javascript/mastodon/features/lists/index.js b/app/javascript/mastodon/features/lists/index.js
index ca1fa1f5e..29c311809 100644
--- a/app/javascript/mastodon/features/lists/index.js
+++ b/app/javascript/mastodon/features/lists/index.js
@@ -48,7 +48,7 @@ class Lists extends ImmutablePureComponent {
   }
 
   render () {
-    const { intl, shouldUpdateScroll, lists, multiColumn } = this.props;
+    const { intl, lists, multiColumn } = this.props;
 
     if (!lists) {
       return (
@@ -68,7 +68,6 @@ class Lists extends ImmutablePureComponent {
 
         <ScrollableList
           scrollKey='lists'
-          shouldUpdateScroll={shouldUpdateScroll}
           emptyMessage={emptyMessage}
           prepend={<ColumnSubheading text={intl.formatMessage(messages.subheading)} />}
           bindToDocument={!multiColumn}
diff --git a/app/javascript/mastodon/features/mutes/index.js b/app/javascript/mastodon/features/mutes/index.js
index 17ff5c762..c1d50d194 100644
--- a/app/javascript/mastodon/features/mutes/index.js
+++ b/app/javascript/mastodon/features/mutes/index.js
@@ -29,7 +29,6 @@ class Mutes extends ImmutablePureComponent {
   static propTypes = {
     params: PropTypes.object.isRequired,
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     hasMore: PropTypes.bool,
     isLoading: PropTypes.bool,
     accountIds: ImmutablePropTypes.list,
@@ -46,7 +45,7 @@ class Mutes extends ImmutablePureComponent {
   }, 300, { leading: true });
 
   render () {
-    const { intl, shouldUpdateScroll, hasMore, accountIds, multiColumn, isLoading } = this.props;
+    const { intl, hasMore, accountIds, multiColumn, isLoading } = this.props;
 
     if (!accountIds) {
       return (
@@ -66,7 +65,6 @@ class Mutes extends ImmutablePureComponent {
           onLoadMore={this.handleLoadMore}
           hasMore={hasMore}
           isLoading={isLoading}
-          shouldUpdateScroll={shouldUpdateScroll}
           emptyMessage={emptyMessage}
           bindToDocument={!multiColumn}
         >
diff --git a/app/javascript/mastodon/features/notifications/index.js b/app/javascript/mastodon/features/notifications/index.js
index 1a621eca9..a6a277d7e 100644
--- a/app/javascript/mastodon/features/notifications/index.js
+++ b/app/javascript/mastodon/features/notifications/index.js
@@ -74,7 +74,6 @@ class Notifications extends React.PureComponent {
     notifications: ImmutablePropTypes.list.isRequired,
     showFilterBar: PropTypes.bool.isRequired,
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     intl: PropTypes.object.isRequired,
     isLoading: PropTypes.bool,
     isUnread: PropTypes.bool,
@@ -176,7 +175,7 @@ class Notifications extends React.PureComponent {
   };
 
   render () {
-    const { intl, notifications, shouldUpdateScroll, isLoading, isUnread, columnId, multiColumn, hasMore, numPending, showFilterBar, lastReadId, canMarkAsRead, needsNotificationPermission } = this.props;
+    const { intl, notifications, isLoading, isUnread, columnId, multiColumn, hasMore, numPending, showFilterBar, lastReadId, canMarkAsRead, needsNotificationPermission } = this.props;
     const pinned = !!columnId;
     const emptyMessage = <FormattedMessage id='empty_column.notifications' defaultMessage="You don't have any notifications yet. When other people interact with you, you will see it here." />;
 
@@ -227,7 +226,6 @@ class Notifications extends React.PureComponent {
         onLoadPending={this.handleLoadPending}
         onScrollToTop={this.handleScrollToTop}
         onScroll={this.handleScroll}
-        shouldUpdateScroll={shouldUpdateScroll}
         bindToDocument={!multiColumn}
       >
         {scrollableContent}
diff --git a/app/javascript/mastodon/features/pinned_statuses/index.js b/app/javascript/mastodon/features/pinned_statuses/index.js
index ad5c9cafc..f32bd6d23 100644
--- a/app/javascript/mastodon/features/pinned_statuses/index.js
+++ b/app/javascript/mastodon/features/pinned_statuses/index.js
@@ -24,7 +24,6 @@ class PinnedStatuses extends ImmutablePureComponent {
 
   static propTypes = {
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     statusIds: ImmutablePropTypes.list.isRequired,
     intl: PropTypes.object.isRequired,
     hasMore: PropTypes.bool.isRequired,
@@ -44,7 +43,7 @@ class PinnedStatuses extends ImmutablePureComponent {
   }
 
   render () {
-    const { intl, shouldUpdateScroll, statusIds, hasMore, multiColumn } = this.props;
+    const { intl, statusIds, hasMore, multiColumn } = this.props;
 
     return (
       <Column bindToDocument={!multiColumn} icon='thumb-tack' heading={intl.formatMessage(messages.heading)} ref={this.setRef}>
@@ -53,7 +52,6 @@ class PinnedStatuses extends ImmutablePureComponent {
           statusIds={statusIds}
           scrollKey='pinned_statuses'
           hasMore={hasMore}
-          shouldUpdateScroll={shouldUpdateScroll}
           bindToDocument={!multiColumn}
         />
       </Column>
diff --git a/app/javascript/mastodon/features/public_timeline/index.js b/app/javascript/mastodon/features/public_timeline/index.js
index 988b1b070..b1d5518af 100644
--- a/app/javascript/mastodon/features/public_timeline/index.js
+++ b/app/javascript/mastodon/features/public_timeline/index.js
@@ -43,7 +43,6 @@ class PublicTimeline extends React.PureComponent {
 
   static propTypes = {
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     intl: PropTypes.object.isRequired,
     columnId: PropTypes.string,
     multiColumn: PropTypes.bool,
@@ -106,7 +105,7 @@ class PublicTimeline extends React.PureComponent {
   }
 
   render () {
-    const { intl, shouldUpdateScroll, columnId, hasUnread, multiColumn, onlyMedia, onlyRemote } = this.props;
+    const { intl, columnId, hasUnread, multiColumn, onlyMedia, onlyRemote } = this.props;
     const pinned = !!columnId;
 
     return (
@@ -130,7 +129,6 @@ class PublicTimeline extends React.PureComponent {
           trackScroll={!pinned}
           scrollKey={`public_timeline-${columnId}`}
           emptyMessage={<FormattedMessage id='empty_column.public' defaultMessage='There is nothing here! Write something publicly, or manually follow users from other servers to fill it up' />}
-          shouldUpdateScroll={shouldUpdateScroll}
           bindToDocument={!multiColumn}
         />
       </Column>
diff --git a/app/javascript/mastodon/features/reblogs/index.js b/app/javascript/mastodon/features/reblogs/index.js
index 4becb5fb7..0fbd09415 100644
--- a/app/javascript/mastodon/features/reblogs/index.js
+++ b/app/javascript/mastodon/features/reblogs/index.js
@@ -27,7 +27,6 @@ class Reblogs extends ImmutablePureComponent {
   static propTypes = {
     params: PropTypes.object.isRequired,
     dispatch: PropTypes.func.isRequired,
-    shouldUpdateScroll: PropTypes.func,
     accountIds: ImmutablePropTypes.list,
     multiColumn: PropTypes.bool,
     intl: PropTypes.object.isRequired,
@@ -50,7 +49,7 @@ class Reblogs extends ImmutablePureComponent {
   }
 
   render () {
-    const { intl, shouldUpdateScroll, accountIds, multiColumn } = this.props;
+    const { intl, accountIds, multiColumn } = this.props;
 
     if (!accountIds) {
       return (
@@ -74,7 +73,6 @@ class Reblogs extends ImmutablePureComponent {
 
         <ScrollableList
           scrollKey='reblogs'
-          shouldUpdateScroll={shouldUpdateScroll}
           emptyMessage={emptyMessage}
           bindToDocument={!multiColumn}
         >
diff --git a/app/javascript/mastodon/features/status/index.js b/app/javascript/mastodon/features/status/index.js
index df8362a1b..69cd245fb 100644
--- a/app/javascript/mastodon/features/status/index.js
+++ b/app/javascript/mastodon/features/status/index.js
@@ -45,7 +45,7 @@ import { initBlockModal } from '../../actions/blocks';
 import { initBoostModal } from '../../actions/boosts';
 import { initReport } from '../../actions/reports';
 import { makeGetStatus, makeGetPictureInPicture } from '../../selectors';
-import { ScrollContainer } from 'react-router-scroll-4';
+import ScrollContainer from 'mastodon/containers/scroll_container';
 import ColumnBackButton from '../../components/column_back_button';
 import ColumnHeader from '../../components/column_header';
 import StatusContainer from '../../containers/status_container';
@@ -498,7 +498,7 @@ class Status extends ImmutablePureComponent {
 
   render () {
     let ancestors, descendants;
-    const { shouldUpdateScroll, status, ancestorsIds, descendantsIds, intl, domain, multiColumn, pictureInPicture } = this.props;
+    const { status, ancestorsIds, descendantsIds, intl, domain, multiColumn, pictureInPicture } = this.props;
     const { fullscreen } = this.state;
 
     if (status === null) {
@@ -541,7 +541,7 @@ class Status extends ImmutablePureComponent {
           )}
         />
 
-        <ScrollContainer scrollKey='thread' shouldUpdateScroll={shouldUpdateScroll}>
+        <ScrollContainer scrollKey='thread'>
           <div className={classNames('scrollable', { fullscreen })} ref={this.setRef}>
             {ancestors}
 
diff --git a/app/javascript/mastodon/features/ui/components/audio_modal.js b/app/javascript/mastodon/features/ui/components/audio_modal.js
index 0676bd9cf..c46fefce8 100644
--- a/app/javascript/mastodon/features/ui/components/audio_modal.js
+++ b/app/javascript/mastodon/features/ui/components/audio_modal.js
@@ -4,7 +4,6 @@ import PropTypes from 'prop-types';
 import Audio from 'mastodon/features/audio';
 import { connect } from 'react-redux';
 import ImmutablePureComponent from 'react-immutable-pure-component';
-import { previewState } from './video_modal';
 import Footer from 'mastodon/features/picture_in_picture/components/footer';
 
 const mapStateToProps = (state, { statusId }) => ({
@@ -25,32 +24,6 @@ class AudioModal extends ImmutablePureComponent {
     onChangeBackgroundColor: PropTypes.func.isRequired,
   };
 
-  static contextTypes = {
-    router: PropTypes.object,
-  };
-
-  componentDidMount () {
-    if (this.context.router) {
-      const history = this.context.router.history;
-
-      history.push(history.location.pathname, previewState);
-
-      this.unlistenHistory = history.listen(() => {
-        this.props.onClose();
-      });
-    }
-  }
-
-  componentWillUnmount () {
-    if (this.context.router) {
-      this.unlistenHistory();
-
-      if (this.context.router.history.location.state === previewState) {
-        this.context.router.history.goBack();
-      }
-    }
-  }
-
   render () {
     const { media, accountStaticAvatar, statusId, onClose } = this.props;
     const options = this.props.options || {};
diff --git a/app/javascript/mastodon/features/ui/components/media_modal.js b/app/javascript/mastodon/features/ui/components/media_modal.js
index 08da10330..061776e24 100644
--- a/app/javascript/mastodon/features/ui/components/media_modal.js
+++ b/app/javascript/mastodon/features/ui/components/media_modal.js
@@ -20,8 +20,6 @@ const messages = defineMessages({
   next: { id: 'lightbox.next', defaultMessage: 'Next' },
 });
 
-export const previewState = 'previewMediaModal';
-
 export default @injectIntl
 class MediaModal extends ImmutablePureComponent {
 
@@ -37,10 +35,6 @@ class MediaModal extends ImmutablePureComponent {
     volume: PropTypes.number,
   };
 
-  static contextTypes = {
-    router: PropTypes.object,
-  };
-
   state = {
     index: null,
     navigationHidden: false,
@@ -98,16 +92,6 @@ class MediaModal extends ImmutablePureComponent {
   componentDidMount () {
     window.addEventListener('keydown', this.handleKeyDown, false);
 
-    if (this.context.router) {
-      const history = this.context.router.history;
-
-      history.push(history.location.pathname, previewState);
-
-      this.unlistenHistory = history.listen(() => {
-        this.props.onClose();
-      });
-    }
-
     this._sendBackgroundColor();
   }
 
@@ -131,14 +115,6 @@ class MediaModal extends ImmutablePureComponent {
   componentWillUnmount () {
     window.removeEventListener('keydown', this.handleKeyDown);
 
-    if (this.context.router) {
-      this.unlistenHistory();
-
-      if (this.context.router.history.location.state === previewState) {
-        this.context.router.history.goBack();
-      }
-    }
-
     this.props.onChangeBackgroundColor(null);
   }
 
diff --git a/app/javascript/mastodon/features/ui/components/video_modal.js b/app/javascript/mastodon/features/ui/components/video_modal.js
index 2f13a175a..7e8e1329d 100644
--- a/app/javascript/mastodon/features/ui/components/video_modal.js
+++ b/app/javascript/mastodon/features/ui/components/video_modal.js
@@ -6,8 +6,6 @@ import ImmutablePureComponent from 'react-immutable-pure-component';
 import Footer from 'mastodon/features/picture_in_picture/components/footer';
 import { getAverageFromBlurhash } from 'mastodon/blurhash';
 
-export const previewState = 'previewVideoModal';
-
 export default class VideoModal extends ImmutablePureComponent {
 
   static propTypes = {
@@ -22,19 +20,9 @@ export default class VideoModal extends ImmutablePureComponent {
     onChangeBackgroundColor: PropTypes.func.isRequired,
   };
 
-  static contextTypes = {
-    router: PropTypes.object,
-  };
-
   componentDidMount () {
-    const { router } = this.context;
     const { media, onChangeBackgroundColor, onClose } = this.props;
 
-    if (router) {
-      router.history.push(router.history.location.pathname, previewState);
-      this.unlistenHistory = router.history.listen(() => onClose());
-    }
-
     const backgroundColor = getAverageFromBlurhash(media.get('blurhash'));
 
     if (backgroundColor) {
@@ -42,18 +30,6 @@ export default class VideoModal extends ImmutablePureComponent {
     }
   }
 
-  componentWillUnmount () {
-    const { router } = this.context;
-
-    if (router) {
-      this.unlistenHistory();
-
-      if (router.history.location.state === previewState) {
-        router.history.goBack();
-      }
-    }
-  }
-
   render () {
     const { media, statusId, onClose } = this.props;
     const options = this.props.options || {};
diff --git a/app/javascript/mastodon/features/ui/containers/modal_container.js b/app/javascript/mastodon/features/ui/containers/modal_container.js
index 2d27180f7..ad1e8a2ee 100644
--- a/app/javascript/mastodon/features/ui/containers/modal_container.js
+++ b/app/javascript/mastodon/features/ui/containers/modal_container.js
@@ -3,8 +3,8 @@ import { closeModal } from '../../../actions/modal';
 import ModalRoot from '../components/modal_root';
 
 const mapStateToProps = state => ({
-  type: state.get('modal').modalType,
-  props: state.get('modal').modalProps,
+  type: state.getIn(['modal', 0, 'modalType'], null),
+  props: state.getIn(['modal', 0, 'modalProps'], {}),
 });
 
 const mapDispatchToProps = dispatch => ({
diff --git a/app/javascript/mastodon/features/ui/index.js b/app/javascript/mastodon/features/ui/index.js
index c1c6ac739..756a69293 100644
--- a/app/javascript/mastodon/features/ui/index.js
+++ b/app/javascript/mastodon/features/ui/index.js
@@ -54,8 +54,6 @@ import {
   FollowRecommendations,
 } from './util/async-components';
 import { me } from '../../initial_state';
-import { previewState as previewMediaState } from './components/media_modal';
-import { previewState as previewVideoState } from './components/video_modal';
 import { closeOnboarding, INTRODUCTION_VERSION } from 'mastodon/actions/onboarding';
 
 // Dummy import, to make sure that <Status /> ends up in the application bundle.
@@ -138,10 +136,6 @@ class SwitchingColumnsArea extends React.PureComponent {
     }
   }
 
-  shouldUpdateScroll (_, { location }) {
-    return location.state !== previewMediaState && location.state !== previewVideoState;
-  }
-
   setRef = c => {
     if (c) {
       this.node = c.getWrappedInstance();
@@ -158,38 +152,38 @@ class SwitchingColumnsArea extends React.PureComponent {
           {redirect}
           <WrappedRoute path='/getting-started' component={GettingStarted} content={children} />
           <WrappedRoute path='/keyboard-shortcuts' component={KeyboardShortcuts} content={children} />
-          <WrappedRoute path='/timelines/home' component={HomeTimeline} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-          <WrappedRoute path='/timelines/public' exact component={PublicTimeline} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-          <WrappedRoute path='/timelines/public/local' exact component={CommunityTimeline} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-          <WrappedRoute path='/timelines/direct' component={DirectTimeline} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-          <WrappedRoute path='/timelines/tag/:id' component={HashtagTimeline} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-          <WrappedRoute path='/timelines/list/:id' component={ListTimeline} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-
-          <WrappedRoute path='/notifications' component={Notifications} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-          <WrappedRoute path='/favourites' component={FavouritedStatuses} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
+          <WrappedRoute path='/timelines/home' component={HomeTimeline} content={children} />
+          <WrappedRoute path='/timelines/public' exact component={PublicTimeline} content={children} />
+          <WrappedRoute path='/timelines/public/local' exact component={CommunityTimeline} content={children} />
+          <WrappedRoute path='/timelines/direct' component={DirectTimeline} content={children} />
+          <WrappedRoute path='/timelines/tag/:id' component={HashtagTimeline} content={children} />
+          <WrappedRoute path='/timelines/list/:id' component={ListTimeline} content={children} />
+
+          <WrappedRoute path='/notifications' component={Notifications} content={children} />
+          <WrappedRoute path='/favourites' component={FavouritedStatuses} content={children} />
           <WrappedRoute path='/bookmarks' component={BookmarkedStatuses} content={children} />
-          <WrappedRoute path='/pinned' component={PinnedStatuses} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
+          <WrappedRoute path='/pinned' component={PinnedStatuses} content={children} />
 
           <WrappedRoute path='/start' component={FollowRecommendations} content={children} />
           <WrappedRoute path='/search' component={Search} content={children} />
-          <WrappedRoute path='/directory' component={Directory} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
+          <WrappedRoute path='/directory' component={Directory} content={children} />
 
           <WrappedRoute path='/statuses/new' component={Compose} content={children} />
-          <WrappedRoute path='/statuses/:statusId' exact component={Status} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-          <WrappedRoute path='/statuses/:statusId/reblogs' component={Reblogs} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-          <WrappedRoute path='/statuses/:statusId/favourites' component={Favourites} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-
-          <WrappedRoute path='/accounts/:accountId' exact component={AccountTimeline} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-          <WrappedRoute path='/accounts/:accountId/with_replies' component={AccountTimeline} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll, withReplies: true }} />
-          <WrappedRoute path='/accounts/:accountId/followers' component={Followers} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-          <WrappedRoute path='/accounts/:accountId/following' component={Following} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-          <WrappedRoute path='/accounts/:accountId/media' component={AccountGallery} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-
-          <WrappedRoute path='/follow_requests' component={FollowRequests} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-          <WrappedRoute path='/blocks' component={Blocks} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-          <WrappedRoute path='/domain_blocks' component={DomainBlocks} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-          <WrappedRoute path='/mutes' component={Mutes} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
-          <WrappedRoute path='/lists' component={Lists} content={children} componentParams={{ shouldUpdateScroll: this.shouldUpdateScroll }} />
+          <WrappedRoute path='/statuses/:statusId' exact component={Status} content={children} />
+          <WrappedRoute path='/statuses/:statusId/reblogs' component={Reblogs} content={children} />
+          <WrappedRoute path='/statuses/:statusId/favourites' component={Favourites} content={children} />
+
+          <WrappedRoute path='/accounts/:accountId' exact component={AccountTimeline} content={children} />
+          <WrappedRoute path='/accounts/:accountId/with_replies' component={AccountTimeline} content={children} componentParams={{ withReplies: true }} />
+          <WrappedRoute path='/accounts/:accountId/followers' component={Followers} content={children} />
+          <WrappedRoute path='/accounts/:accountId/following' component={Following} content={children} />
+          <WrappedRoute path='/accounts/:accountId/media' component={AccountGallery} content={children} />
+
+          <WrappedRoute path='/follow_requests' component={FollowRequests} content={children} />
+          <WrappedRoute path='/blocks' component={Blocks} content={children} />
+          <WrappedRoute path='/domain_blocks' component={DomainBlocks} content={children} />
+          <WrappedRoute path='/mutes' component={Mutes} content={children} />
+          <WrappedRoute path='/lists' component={Lists} content={children} />
 
           <WrappedRoute component={GenericNotFound} content={children} />
         </WrappedSwitch>
diff --git a/app/javascript/mastodon/reducers/modal.js b/app/javascript/mastodon/reducers/modal.js
index cb53887c7..ea81b4332 100644
--- a/app/javascript/mastodon/reducers/modal.js
+++ b/app/javascript/mastodon/reducers/modal.js
@@ -1,19 +1,15 @@
 import { MODAL_OPEN, MODAL_CLOSE } from '../actions/modal';
 import { TIMELINE_DELETE } from '../actions/timelines';
+import { Stack as ImmutableStack, Map as ImmutableMap } from 'immutable';
 
-const initialState = {
-  modalType: null,
-  modalProps: {},
-};
-
-export default function modal(state = initialState, action) {
+export default function modal(state = ImmutableStack(), action) {
   switch(action.type) {
   case MODAL_OPEN:
-    return { modalType: action.modalType, modalProps: action.modalProps };
+        return state.unshift(ImmutableMap({ modalType: action.modalType, modalProps: action.modalProps }));
   case MODAL_CLOSE:
-    return (action.modalType === undefined || action.modalType === state.modalType) ? initialState : state;
+    return (action.modalType === undefined || action.modalType === state.getIn([0, 'modalType'])) ? state.shift() : state;
   case TIMELINE_DELETE:
-    return (state.modalProps.statusId === action.id) ? initialState : state;
+        return state.filterNot((modal) => modal.get('modalProps').statusId === action.id);
   default:
     return state;
   }