Dylan Hunn a4ebe8656e fix(forms): registerOnValidatorChange should be called for ngModelGroup. (#41971)
The Validator and AsyncValidator interfaces provide a callback, `registerOnValidatorChange(fn)`. `registerOnValidatorChange` is supposed to be fired at least once to register `fn` with the validator. `fn` is then called by the validator whenever its inputs change. This was previously not happening for FormGroup validators, and is now fixed.

PR Close #41971
2021-05-13 13:57:47 -04:00
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