Adding option group support for select

[vamsiampolu]

Is it possible to support option groups for select using react-jsonschema-form configuration, I do understand that I can add non standard properties to 'ui:options' but is there any way to do it without having to go for that.

It would also be great if we could automatically use the maxItems and minItems validation could be added to the multiple Select widget instead of having to recieve it from the schema and use it ourselves.

[glasserc]

I'm sorry, I don't really understand. Is this two issues? I feel like option groups should be one issue (to which I think the correct answer is to add something to uiSchema). I don't see how it relates to maxItems and minItems in the MultiSelect case.

[epicfaace]

Closing this issue due to inactivity. @vamsiampolu if you want to clarify your request, please do.

[nagaozen]

Implemented as mentioned at #1813 (comment)