SelectArrayInput has no multiselection indication for screenreaders

[tiagoit]

What you were expecting:
When using a SelectArrayInput the screenreaders don't indicate that this field can have a multiselection as we have with a regular select element containing the multiple attribute.

What happened instead:
Screenreaders read the element as a regular list of items.

Steps to reproduce:
Use a screenreader application to inspect a SelectArrayInput component.

Related code:

<ReferenceArrayInput source="serviceTypesIds" reference="service-types" fullWidth>
    <SelectArrayInput optionText="name" />
</ReferenceArrayInput>

Other information:

Environment

• React-admin version: 3.15.2
• Last version that did not exhibit the issue (if applicable):
• React version: 17.0.2
• Browser: 96.0.4664.110
• Stack trace (in case of a JS error):

[frastlin]

Here is an example of correct behavior, see the multiselect heading:
https://mui.com/components/selects/
Here is a description of what should happen:
http://whatsock.com/Templates/Listboxes/Multiselect/index.htm
Here is a free screen reader to test on Windows:
https://www.nvaccess.org/download/

[fzaninotto]

This was a MUI bug (mui/material-ui#38631) fixed in September 2023 (mui/material-ui#38855) and released in MUI v5.14.11 (https://github.com/mui/material-ui/releases/tag/v5.14.11).