Focus redirection does not work for mat-radio-button

[jelbourn]

mat-radio-button has some code to redirect focus to the underlying native <input type="radio">. This seems to not actually work, though, because calling .focus() on the <mat-radio-button> does not trigger a focus event.

You can see the behavior here, with radio buttons inside of a dialog with cdkFocusInitial

The same problem almost certainly exists for mat-checkbox and mat-button-toggle.

I'm not sure the best way to approach this, but one idea would be to use focusin or useCapture on a top-level element and specifically check for the controls in question.