fix: collapsible space toggle issue

backend/open_webui/apps/webui/routers/folders.py

@@ -215,7 +215,18 @@ async def delete_folder_by_id(id: str, user=Depends(get_verified_user)):
     if folder:
         try:
             result = Folders.delete_folder_by_id_and_user_id(id, user.id)
-            return result
+            if result:
+                # Delete all chats in the folder
+                chats = Chats.get_chats_by_folder_id_and_user_id(id, user.id)
+                for chat in chats:
+                    Chats.delete_chat_by_id(chat.id, user.id)
+
+                return result
+            else:
+                raise HTTPException(
+                    status_code=status.HTTP_400_BAD_REQUEST,
+                    detail=ERROR_MESSAGES.DEFAULT("Error deleting folder"),
+                )
         except Exception as e:
             log.exception(e)
             log.error(f"Error deleting folder: {id}")