className default is lost when props.className is undefined in UncontrolledTabs

In the UncontrolledTabs component, default props are merged using object spreading:

const { className, ...attributes } = { ...defaultProps, ...props, };

Even the defaultProps.className is defined ('react-tabs') and props.className is explicitly undefined, the spread operation will overwrite the default and set className to undefined.

As a result, the default class name is lost. It's unclear whether this behavior is intended, but it can lead to unexpected issues, especially when upgrading from older versions where the default class was always applied. Projects relying on the default 'react-tabs' class for styling or selectors may break silently.

Commencez par le composant UncontrolledTabs et examinez l’expansion d’objet de default-props, en reproduisant le cas où props.className est explicitement undefined. Confirmez le comportement attendu pour la classe "react-tabs" par défaut et vérifiez que la classe reste appliquée sans perturber un className fourni explicitement.