Check alternates when comparing to the common ancestor

This is the actual bugfix.
facebook · Oct 9, 2017 · 420b58a · 420b58a
1 parent 79b84d8
commit 420b58a
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/src/renderers/shared/shared/ReactTreeTraversal.js b/src/renderers/shared/shared/ReactTreeTraversal.js
@@ -119,6 +119,10 @@ function traverseEnterLeave(from, to, fn, argFrom, argTo) {
     if (from === common) {
       break;
     }
+    const alternate = from.alternate;
+    if (alternate !== null && alternate === common) {
+      break;
+    }
     pathFrom.push(from);
     from = getParent(from);
   }
@@ -130,6 +134,10 @@ function traverseEnterLeave(from, to, fn, argFrom, argTo) {
     if (to === common) {
       break;
     }
+    const alternate = to.alternate;
+    if (alternate !== null && alternate === common) {
+      break;
+    }
     pathTo.push(to);
     to = getParent(to);
   }