We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Superuser can change his status
In `StaffForm`:
https://github.com/mirumee/saleor/blob/master/saleor/dashboard/staff/forms.py#L12-L13
Widget is disabled `self.fields['is_staff'].widget.attrs['disabled'] = True` 
But it won't prevent you from changing values on POST.
We should disable field instead, like `self.fields['is_active'].disabled = True` 
Test covering this would be nice as well.


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `saleor/dashboard/staff/forms.py`
Content:
```
1 from django import forms
2 
3 from ...userprofile.models import User
4 
5 
6 class StaffForm(forms.ModelForm):
7     def __init__(self, *args, **kwargs):
8         self.user = kwargs.pop('user', None)
9         kwargs.update(initial={'is_staff': True})
10         super(StaffForm, self).__init__(*args, **kwargs)
11         if self.user == self.instance:
12             self.fields['is_staff'].widget.attrs['disabled'] = True
13             self.fields['is_active'].widget.attrs['disabled'] = True
14 
15     class Meta:
16         model = User
17         fields = ['email', 'groups', 'is_staff', 'is_active']
18
```
--- 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/saleor/dashboard/staff/forms.py b/saleor/dashboard/staff/forms.py
--- a/saleor/dashboard/staff/forms.py
+++ b/saleor/dashboard/staff/forms.py
@@ -9,8 +9,8 @@
         kwargs.update(initial={'is_staff': True})
         super(StaffForm, self).__init__(*args, **kwargs)
         if self.user == self.instance:
-            self.fields['is_staff'].widget.attrs['disabled'] = True
-            self.fields['is_active'].widget.attrs['disabled'] = True
+            self.fields['is_staff'].disabled = True
+            self.fields['is_active'].disabled = True
 
     class Meta:
         model = User

{"golden_diff": "diff --git a/saleor/dashboard/staff/forms.py b/saleor/dashboard/staff/forms.py\n--- a/saleor/dashboard/staff/forms.py\n+++ b/saleor/dashboard/staff/forms.py\n@@ -9,8 +9,8 @@\n         kwargs.update(initial={'is_staff': True})\n         super(StaffForm, self).__init__(*args, **kwargs)\n         if self.user == self.instance:\n-            self.fields['is_staff'].widget.attrs['disabled'] = True\n-            self.fields['is_active'].widget.attrs['disabled'] = True\n+            self.fields['is_staff'].disabled = True\n+            self.fields['is_active'].disabled = True\n \n     class Meta:\n         model = User\n", "issue": "Superuser can change his status\nIn `StaffForm`:\r\nhttps://github.com/mirumee/saleor/blob/master/saleor/dashboard/staff/forms.py#L12-L13\r\nWidget is disabled `self.fields['is_staff'].widget.attrs['disabled'] = True` \r\nBut it won't prevent you from changing values on POST.\r\nWe should disable field instead, like `self.fields['is_active'].disabled = True` \r\nTest covering this would be nice as well.\r\n\n", "before_files": [{"content": "from django import forms\n\nfrom ...userprofile.models import User\n\n\nclass StaffForm(forms.ModelForm):\n    def __init__(self, *args, **kwargs):\n        self.user = kwargs.pop('user', None)\n        kwargs.update(initial={'is_staff': True})\n        super(StaffForm, self).__init__(*args, **kwargs)\n        if self.user == self.instance:\n            self.fields['is_staff'].widget.attrs['disabled'] = True\n            self.fields['is_active'].widget.attrs['disabled'] = True\n\n    class Meta:\n        model = User\n        fields = ['email', 'groups', 'is_staff', 'is_active']\n", "path": "saleor/dashboard/staff/forms.py"}], "after_files": [{"content": "from django import forms\n\nfrom ...userprofile.models import User\n\n\nclass StaffForm(forms.ModelForm):\n    def __init__(self, *args, **kwargs):\n        self.user = kwargs.pop('user', None)\n        kwargs.update(initial={'is_staff': True})\n        super(StaffForm, self).__init__(*args, **kwargs)\n        if self.user == self.instance:\n            self.fields['is_staff'].disabled = True\n            self.fields['is_active'].disabled = True\n\n    class Meta:\n        model = User\n        fields = ['email', 'groups', 'is_staff', 'is_active']\n", "path": "saleor/dashboard/staff/forms.py"}]}