Clear filter action doesn't appear when filter has alwaysOn props

[JinParc]

Description:

When any filter elements that has alwaysOn as true in filters prop on <List /> component, Remove Filter action menu doesn't appears on Add Filter Button.

I assume, user should be able to remove filter by clicking reset(x mark on the right side of input) button and by clicking Remove Filter menu on Add Filter Button.

What you were expecting:

Remove Filter menu is appeared, even the filter input has alwaysOn prop.
So that, a user can remove all filter by clicking the menu.

What happened instead:

Remove Filter menu doesn't appear on the menu.

code sandbox link : https://codesandbox.io/s/broken-silence-8k4x5u?file=/src/posts/PostList.tsx

Steps to reproduce:

1. Choose any id on <AutocompleteInput /> that is produced or add any value on <SearchInput /> that is provided
2. Click Add Filter Button

Environment

• React-admin version: "^4.2.0"
• Last version that did not exhibit the issue (if applicable):
• React version: "^17.0.2",
• Browser: Chrome

[WiXSL]

Reproduced. Thanks!