[SailfishOS] Text field validators mark incomplete input as invalid

Minman writes:

Once you start typing in one of the forms of the application it will be validated immediately which result in a unvalid red form until you enter the right value. I would like to have it the other way around. Giving a green border when the validation passes. And giving the unvalidated state on dirty + blur or submitting the form. (reward early, punish late)

The default RegExpValidator behavior "focuses" on the incomplete input. Figure out if there's a way to adjust the behavior and/or to implement alternative "now it's OK" indicator.