p-inputmask does not update "p-filled" class after doing a FormGroup.patchValue()

[clydebates]

Describe the bug

Using .patchValue() on a <input pInputText formControlName="myControl" /> works as expected. It inserts a "p-filled" class in the DOM, which allows FloatLabel to work correctly.

However, this expected behavior does NOT work with <p-inputmask>. Since the "p-filled" class is not inserted on the input element's classList, the FloatLabel overlaps the value.

HTML:

<form [formGroup]="myFormGroup">
  <div>
    <p-floatlabel variant="on">
      <p-inputmask
        aria-label="Zip Code"
        mask="99999"
        type="text"
        id="zipCode"
        formControlName="myControl"
      >
      </p-inputmask>
      <label for="zipCode"
        >Zip Code
        <span class="asterisk" aria-hidden="true">*</span>
      </label>
    </p-floatlabel>
  </div>
</form>

TS:

  ngOnInit() {
    this.myFormGroup = this.formBuilder.group({
      myControl: [''],
    });
  }

  onClick() {
    this.myFormGroup.patchValue({ myControl: '77777' });
  }

Result:

Workaround:

myFormGroup.patchValue({myControl: '77777'});
addPrimeNgFilledClass('zipCode');

...

function addPrimeNgFilledClass(elementId: string) {
    const inputElementToFill: HTMLInputElement = document.getElementById(elementId)?.firstChild as HTMLInputElement;
    inputElementToFill?.classList.add('p-filled');
}

Workaround result:

Pull Request Link

No response

Reason for not contributing a PR

• Lack of time
• Unsure how to implement the fix/feature
• Difficulty understanding the codebase
• Other

Other Reason

No response

Reproducer

https://stackblitz.com/edit/github-5jz2m89t-m7nk9x27?file=src%2Fapp%2Fapp.component.ts,src%2Fapp%2Fapp.component.html

Environment

develop, check the reproducer link

Angular version

19.0.6

PrimeNG version

v19

Node version

23.6.1

Browser(s)

No response

Steps to reproduce the behavior

Open StackBlitz: https://stackblitz.com/edit/github-5jz2m89t-m7nk9x27?file=src%2Fapp%2Fapp.component.ts,src%2Fapp%2Fapp.component.html

Click the "Patch Value" button. This will fire a .patchValue() on the form and update the value in the p-inputmask to "77777".

Notice the label does not move to the "on" position, instead overlays the value.

This is because the inputmask has not updated it's "filled" state.

Open the DevTools, manually add the class "p-filled" to the input, notice that the issue is fixed.

Expected behavior

inputmask should update its "filled" state when a .patchValue() is sent from a Reactive Form.

FloatLabel should move to the "on" position once there is a value inserted.