Radio buttons are missing a tabindex input

[jelbourn]

Currently there is no way to customize the tabindex for mat-radio-button; it will always use the native radio's default order.

[devversion]

I think there was a specific reason why we didn't just apply the tabindex mixin on the radio buttons. I think in general it just doesn't make sense adding a tabIndex, because the tabindex is controlled by the native radio buttons.

• e.g. you automatically focus the selected radio (the other ones are not tabbable)

In my opinion, it would make sense to support the tabindex on the mat-radio-group and redirect that value to all radio inputs.

[jelbourn]

It is still important to support tabindex for cases when the radios are not in a group.

[devversion]

That's a good point. I will add them.

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