Accent inputs show wrong underline color when invalid

[willshowell]

Bug, feature request, or proposal:

Bug

Expected behavior

The accent underline changes to error color, as it does for primary inputs.

Current behavior

The underline remains the accent color.

Repro

http://plnkr.co/edit/DOt4Wa1nBloTDSSEejPO?p=preview

[ocarreterom]

The placeholder color also toggles to accent/error on focus/blur.

[willshowell]

Workaround in the mean time

// Override until angular/material2/pull/4771
$warn: map-get($theme, warn);
$input-underline-color-warn: mat-color($warn);
.mat-input-container.mat-input-invalid {
  .mat-input-placeholder {
    &, &.mat-accent, &.mat-float .mat-placeholder-required {
      color: $input-underline-color-warn;
    }
  }
  .mat-input-ripple {
    &, &.mat-accent {
      background-color: $input-underline-color-warn;
    }
  }
}

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