Validation error notification doesn't show for Edit page

[ghost]

What you were expecting:
Error notification to be rendered on Edit page just like it did on Create page.

What happened instead:
When a user tries to submit the form on Edit page without filling all the required fields, validation errors are shown below the fields but no notification is shown.
Loom: https://www.loom.com/share/acb982880674400caaa2f16038bbe184
can be properly seen in the loom.

Steps to reproduce:
You can reproduce the error by following the steps shown in the loom in demo example: https://iuxnw.sse.codesandbox.io/#/posts/13

Related code:

• Preferably, a CodeSandbox forked from
  • https://codesandbox.io/s/github/marmelab/react-admin/tree/master/examples/simple (v4)
  • https://codesandbox.io/s/github/marmelab/react-admin/tree/3.x/examples/simple (v3)
• A link to a GitHub repo with the minimal codebase to reproduce the issue

insert short code snippets here

Other information:

Environment

• React-admin version:
• Last version that did not exhibit the issue (if applicable):
• React version:
• Browser:
• Stack trace (in case of a JS error):

[fzaninotto]

Good catch! I'm marking this as a bug, thanks for the report.

[fzaninotto]

The problem lies in the useIsFormInvalid hook, called by the useAugmentedForm hook.