mat-hint not animated when showed for first time on condition

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P4area: material/form-fieldhelp wanted

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Description

Bug, feature request, or proposal:

Maybe a bug, definitely a feature

What is the expected behavior?

When I put a condition on the mat-hint element (for instance, show it only if a character has been typed), the element should be animated and slide in from the input.

What is the current behavior?

At first, the element isn't animated. Until a mat-error is shown, the element won't be animated.

What are the steps to reproduce?

Stackblitz

Guide contributeur

Direction de recherche: The issue likely involves the mat hint animation within Angular Material's form field component. Check the components directory under src/material/form field for animation related code. The Stackblitz demo shows that the hint element doesn't animate on initial conditional display. Examine the animation trigger for the hint element and compare with how mat error animates. Look for differences in the Angular animation state transitions.
Stack technique: angulartypescriptcss
Domaine: frontend
Type d'issue: Bug
Difficulté: 3
Temps estimé: 1-3 heures
Statut d'activité: Ancienne
Clarté: Claire
Prérequis: Angular MaterialCSS animation concepts
Accessibilité débutant: 45