We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Admin: Main menu won't stay hidden
Two issues (at least):
Desktop:  If I close (minimize, desktop) main-menu and click any link, the menu appears again.
Desktop to mobile: If I minimize the menu on a bigger desktop and then drag window smaller the menu appears again. 

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `shuup/admin/views/menu.py`
Content:
```
1 # -*- coding: utf-8 -*-
2 # This file is part of Shuup.
3 #
4 # Copyright (c) 2012-2018, Shuup Inc. All rights reserved.
5 #
6 # This source code is licensed under the OSL-3.0 license found in the
7 # LICENSE file in the root directory of this source tree.
8 from django.http import JsonResponse
9 from django.views.generic import TemplateView, View
10 
11 
12 class MenuView(TemplateView):
13     template_name = "shuup/admin/base/_main_menu.jinja"
14 
15 
16 class MenuToggleView(View):
17     def post(self, request, *args, **kwargs):
18         request.session["menu_open"] = int(request.POST.get("menu_open", 0))
19         return JsonResponse({"success": True})
20
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/shuup/admin/views/menu.py b/shuup/admin/views/menu.py
--- a/shuup/admin/views/menu.py
+++ b/shuup/admin/views/menu.py
@@ -15,5 +15,5 @@
 
 class MenuToggleView(View):
     def post(self, request, *args, **kwargs):
-        request.session["menu_open"] = int(request.POST.get("menu_open", 0))
+        request.session["menu_open"] = not bool(request.session.get("menu_open", True))
         return JsonResponse({"success": True})

{"golden_diff": "diff --git a/shuup/admin/views/menu.py b/shuup/admin/views/menu.py\n--- a/shuup/admin/views/menu.py\n+++ b/shuup/admin/views/menu.py\n@@ -15,5 +15,5 @@\n \n class MenuToggleView(View):\n     def post(self, request, *args, **kwargs):\n-        request.session[\"menu_open\"] = int(request.POST.get(\"menu_open\", 0))\n+        request.session[\"menu_open\"] = not bool(request.session.get(\"menu_open\", True))\n         return JsonResponse({\"success\": True})\n", "issue": "Admin: Main menu won't stay hidden\nTwo issues (at least):\r\nDesktop:  If I close (minimize, desktop) main-menu and click any link, the menu appears again.\r\nDesktop to mobile: If I minimize the menu on a bigger desktop and then drag window smaller the menu appears again. \n", "before_files": [{"content": "# -*- coding: utf-8 -*-\n# This file is part of Shuup.\n#\n# Copyright (c) 2012-2018, Shuup Inc. All rights reserved.\n#\n# This source code is licensed under the OSL-3.0 license found in the\n# LICENSE file in the root directory of this source tree.\nfrom django.http import JsonResponse\nfrom django.views.generic import TemplateView, View\n\n\nclass MenuView(TemplateView):\n    template_name = \"shuup/admin/base/_main_menu.jinja\"\n\n\nclass MenuToggleView(View):\n    def post(self, request, *args, **kwargs):\n        request.session[\"menu_open\"] = int(request.POST.get(\"menu_open\", 0))\n        return JsonResponse({\"success\": True})\n", "path": "shuup/admin/views/menu.py"}], "after_files": [{"content": "# -*- coding: utf-8 -*-\n# This file is part of Shuup.\n#\n# Copyright (c) 2012-2018, Shuup Inc. All rights reserved.\n#\n# This source code is licensed under the OSL-3.0 license found in the\n# LICENSE file in the root directory of this source tree.\nfrom django.http import JsonResponse\nfrom django.views.generic import TemplateView, View\n\n\nclass MenuView(TemplateView):\n    template_name = \"shuup/admin/base/_main_menu.jinja\"\n\n\nclass MenuToggleView(View):\n    def post(self, request, *args, **kwargs):\n        request.session[\"menu_open\"] = not bool(request.session.get(\"menu_open\", True))\n        return JsonResponse({\"success\": True})\n", "path": "shuup/admin/views/menu.py"}]}