Fix height cache (#4909)

app/javascript/mastodon/containers/intersection_observer_article_container.js

@@ -0,0 +1,17 @@
+import { connect } from 'react-redux';
+import IntersectionObserverArticle from '../components/intersection_observer_article';
+import { setHeight } from '../actions/height_cache';
+
+const makeMapStateToProps = (state, props) => ({
+  cachedHeight: state.getIn(['height_cache', props.saveHeightKey, props.id]),
+});
+
+const mapDispatchToProps = (dispatch) => ({
+
+  onHeightChange (key, id, height) {
+    dispatch(setHeight(key, id, height));
+  },
+
+});
+
+export default connect(makeMapStateToProps, mapDispatchToProps)(IntersectionObserverArticle);