Make profile header scroll along with contents. AccountTimeline, Followers and Following are no longer

nested inside a common parent (<Account>), instead they all embed <HeaderContainer />

app/assets/javascripts/components/features/account_timeline/containers/header_container.jsx

@@ -0,0 +1,45 @@
+import { connect } from 'react-redux';
+import { makeGetAccount } from '../../../selectors';
+import Header from '../components/header';
+import {
+  followAccount,
+  unfollowAccount,
+  blockAccount,
+  unblockAccount
+} from '../../../actions/accounts';
+import { mentionCompose } from '../../../actions/compose';
+
+const makeMapStateToProps = () => {
+  const getAccount = makeGetAccount();
+
+  const mapStateToProps = (state, { accountId }) => ({
+    account: getAccount(state, Number(accountId)),
+    me: state.getIn(['meta', 'me'])
+  });
+
+  return mapStateToProps;
+};
+
+const mapDispatchToProps = dispatch => ({
+  onFollow (account) {
+    if (account.getIn(['relationship', 'following'])) {
+      dispatch(unfollowAccount(account.get('id')));
+    } else {
+      dispatch(followAccount(account.get('id')));
+    }
+  },
+
+  onBlock (account) {
+    if (account.getIn(['relationship', 'blocking'])) {
+      dispatch(unblockAccount(account.get('id')));
+    } else {
+      dispatch(blockAccount(account.get('id')));
+    }
+  },
+
+  onMention (account, router) {
+    dispatch(mentionCompose(account, router));
+  }
+});
+
+export default connect(makeMapStateToProps, mapDispatchToProps)(Header);