From ea70e18408a93bd04c8a58130c993a465d0dcec8 Mon Sep 17 00:00:00 2001
From: Yuchao <yuchaoyj@gmail.com>
Date: Fri, 14 Feb 2025 15:19:10 +0800
Subject: [PATCH] fix(nested): prevent parent node activate firing for
 singleLeaf (#20951)

fixes #20946

Co-authored-by: Kael <kaelwd@gmail.com>
---
 .../vuetify/src/composables/nested/nested.ts    | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/packages/vuetify/src/composables/nested/nested.ts b/packages/vuetify/src/composables/nested/nested.ts
index b3ede9a3b84..08ddd9c6318 100644
--- a/packages/vuetify/src/composables/nested/nested.ts
+++ b/packages/vuetify/src/composables/nested/nested.ts
@@ -309,7 +309,22 @@ export const useNested = (props: NestedProps) => {
           event,
         })
 
-        newActivated && (activated.value = newActivated)
+        if (newActivated.size !== activated.value.size) {
+          activated.value = newActivated
+        } else {
+          for (const value of newActivated) {
+            if (!activated.value.has(value)) {
+              activated.value = newActivated
+              return
+            }
+          }
+          for (const value of activated.value) {
+            if (!newActivated.has(value)) {
+              activated.value = newActivated
+              return
+            }
+          }
+        }
       },
       children,
       parents,