From 211f17ac6cd589477935f010443b32c36445d720 Mon Sep 17 00:00:00 2001
From: mohamed yahia <salemmohamed780@gmail.com>
Date: Fri, 6 Sep 2024 01:34:08 +0300
Subject: [PATCH] Fix Sorter usage in StyleManager (#6123)

* Fix Sorter usage in StyleManager.

* Run formatter
---
 packages/core/src/utils/Sorter.ts | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/packages/core/src/utils/Sorter.ts b/packages/core/src/utils/Sorter.ts
index e8d92e88a..bf261efee 100644
--- a/packages/core/src/utils/Sorter.ts
+++ b/packages/core/src/utils/Sorter.ts
@@ -697,7 +697,14 @@ export default class Sorter extends View {
       return result;
     }
 
-    const index = pos ? (pos.method === 'after' ? pos.indexEl + 1 : pos.indexEl) : trgModel.components().length;
+    let length = -1;
+    const isCollection = trgModel instanceof Collection;
+    if (isFunction(trgModel.components)) {
+      length = trgModel.components().length;
+    } else if (isCollection) {
+      length = trgModel.models.length;
+    }
+    const index = pos ? (pos.method === 'after' ? pos.indexEl + 1 : pos.indexEl) : length;
 
     // Check if the source is draggable in target
     let draggable = srcModel.get('draggable');