From 17adf282b371b5bbff6ff5c31d6324760bf2e50d Mon Sep 17 00:00:00 2001
From: boyan <17426470+boyan01@users.noreply.github.com>
Date: Tue, 1 Nov 2022 10:05:47 +0800
Subject: [PATCH] Fix VisibilityDetector callback unmounted error

---
 lib/widgets/message_status_icon.dart | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/widgets/message_status_icon.dart b/lib/widgets/message_status_icon.dart
index 09bbf14a7d..4b5e8bbfbd 100644
--- a/lib/widgets/message_status_icon.dart
+++ b/lib/widgets/message_status_icon.dart
@@ -59,8 +59,14 @@ class _VisibilityAwareAnimatedSendingIcon extends HookWidget {
   Widget build(BuildContext context) {
     final visible = useState(false);
     final key = useMemoized(UniqueKey.new);
+    final isMount = useIsMounted();
     return VisibilityDetector(
       onVisibilityChanged: (info) {
+        if (!isMount()) {
+          // onVisibilityChanged called by WidgetsBinding.postFrameCallback,
+          // so it may be called after unmount.
+          return;
+        }
         visible.value = info.visibleFraction > 0;
       },
       key: key,