Username field length validation lacks failure indicator

[twm]

When I enter a three-character username (say, perhaps, "twm"), the submit button is disabled, but no validation error is shown when I blur the field. This is confusing, as there is no indication why the form can't be submitted.

The ng-invalid class appears to be present. Either it's missing a definition, or the ng-required-valid class has higher precedence. I notice that the ng-required-invalid class works properly (if the field is blank).

Rainy 0.5.0 binary (a.k.a. 0.5.1).