From 2aee39cdc1e4d3540d60de535d3d88a995e24a9e Mon Sep 17 00:00:00 2001
From: Joshua Gross <joshuagross@fb.com>
Date: Mon, 29 Mar 2021 20:27:38 -0700
Subject: [PATCH] StubViewTree: log more information before UPDATE assertion
 failure

Summary:
Log more diagnostics about this assertion failure.

Changelog: [Internal]

Reviewed By: mdvacca

Differential Revision: D27407775

fbshipit-source-id: 7f00215b8b2c0ad7378c5671f3b503daf56b9fd2
---
 ReactCommon/react/renderer/mounting/StubViewTree.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ReactCommon/react/renderer/mounting/StubViewTree.cpp b/ReactCommon/react/renderer/mounting/StubViewTree.cpp
index 577e88e366b..77be82e032e 100644
--- a/ReactCommon/react/renderer/mounting/StubViewTree.cpp
+++ b/ReactCommon/react/renderer/mounting/StubViewTree.cpp
@@ -151,6 +151,11 @@ void StubViewTree::mutate(ShadowViewMutationList const &mutations) {
             registry.find(mutation.newChildShadowView.tag) != registry.end());
         auto oldStubView = registry[mutation.newChildShadowView.tag];
         react_native_assert(oldStubView->tag != 0);
+        if ((ShadowView)(*oldStubView) != mutation.oldChildShadowView) {
+          LOG(ERROR)
+              << "UPDATE mutation assertion failure: oldChildShadowView doesn't match oldStubView: ["
+              << mutation.oldChildShadowView.tag << "]";
+        }
         react_native_assert(
             (ShadowView)(*oldStubView) == mutation.oldChildShadowView);
         oldStubView->update(mutation.newChildShadowView);