Improve IntersectionObserverArticle perf (#5152)

app/javascript/mastodon/components/intersection_observer_article.js

@@ -58,28 +58,33 @@ export default class IntersectionObserverArticle extends React.Component {
   }
 
   handleIntersection = (entry) => {
-    const { onHeightChange, saveHeightKey, id } = this.props;
+    this.entry = entry;
 
-    if (this.node && this.node.children.length !== 0) {
+    scheduleIdleTask(this.calculateHeight);
-      // save the height of the fully-rendered element
+    this.setState(this.updateStateAfterIntersection);
-      this.height = getRectFromEntry(entry).height;
+  }
+
+  updateStateAfterIntersection = (prevState) => {
+    if (prevState.isIntersecting && !this.entry.isIntersecting) {
+      scheduleIdleTask(this.hideIfNotIntersecting);
+    }
+    return {
+      isIntersecting: this.entry.isIntersecting,
+      isHidden: false,
+    };
+  }
+
+  calculateHeight = () => {
+    const { onHeightChange, saveHeightKey, id } = this.props;
+    // save the height of the fully-rendered element (this is expensive
+    // on Chrome, where we need to fall back to getBoundingClientRect)
+    this.height = getRectFromEntry(this.entry).height;
 
     if (onHeightChange && saveHeightKey) {
       onHeightChange(saveHeightKey, id, this.height);
     }
   }
 
-    this.setState((prevState) => {
-      if (prevState.isIntersecting && !entry.isIntersecting) {
-        scheduleIdleTask(this.hideIfNotIntersecting);
-      }
-      return {
-        isIntersecting: entry.isIntersecting,
-        isHidden: false,
-      };
-    });
-  }
-
   hideIfNotIntersecting = () => {
     if (!this.componentMounted) {
       return;