[10.x] Extract dirty getter for performUpdate (#49141)

src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php

@@ -2038,6 +2038,16 @@ public function getDirty()
         return $dirty;
     }
 
+    /**
+     * Get the attributes that have been changed since the last sync for an update operation.
+     *
+     * @return array
+     */
+    protected function getDirtyForUpdate()
+    {
+        return $this->getDirty();
+    }
+
     /**
      * Get the attributes that were changed when the model was last saved.
      *

src/Illuminate/Database/Eloquent/Model.php

@@ -1207,7 +1207,7 @@ protected function performUpdate(Builder $query)
         // Once we have run the update operation, we will fire the "updated" event for
         // this model instance. This will allow developers to hook into these after
         // models are updated, giving them a chance to do any special processing.
-        $dirty = $this->getDirty();
+        $dirty = $this->getDirtyForUpdate();
 
         if (count($dirty) > 0) {
             $this->setKeysForSaveQuery($query)->update($dirty);