From 9c03fd9caef575792f08fd4e5c396d8d72bad09f Mon Sep 17 00:00:00 2001
From: unarist <m.unarist@gmail.com>
Date: Fri, 7 Jul 2017 04:26:21 +0900
Subject: [PATCH] Unobserve status on unmount (#4013)

This fixes a warning on status unmounting (e.g. deletion).

This also resets IntersectionObserverWrapper on disconnect to avoid `unobserve()` calls
which has bug in Edge.
---
 app/javascript/mastodon/components/status.js             | 4 ++++
 .../features/ui/util/intersection_observer_wrapper.js    | 9 +++++++++
 2 files changed, 13 insertions(+)

diff --git a/app/javascript/mastodon/components/status.js b/app/javascript/mastodon/components/status.js
index a837659c2cd..ff574ab3d3b 100644
--- a/app/javascript/mastodon/components/status.js
+++ b/app/javascript/mastodon/components/status.js
@@ -90,6 +90,10 @@ export default class Status extends ImmutablePureComponent {
   }
 
   componentWillUnmount () {
+    if (this.props.intersectionObserverWrapper) {
+      this.props.intersectionObserverWrapper.unobserve(this.props.id, this.node);
+    }
+
     this.componentMounted = false;
   }
 
diff --git a/app/javascript/mastodon/features/ui/util/intersection_observer_wrapper.js b/app/javascript/mastodon/features/ui/util/intersection_observer_wrapper.js
index 0e959f9ae8e..2b24c65831d 100644
--- a/app/javascript/mastodon/features/ui/util/intersection_observer_wrapper.js
+++ b/app/javascript/mastodon/features/ui/util/intersection_observer_wrapper.js
@@ -37,9 +37,18 @@ class IntersectionObserverWrapper {
     }
   }
 
+  unobserve (id, node) {
+    if (this.observer) {
+      delete this.callbacks[id];
+      this.observer.unobserve(node);
+    }
+  }
+
   disconnect () {
     if (this.observer) {
+      this.callbacks = {};
       this.observer.disconnect();
+      this.observer = null;
     }
   }