PrimeVue DatePicker: DatePicker button visually separated when used with InputGroup and FloatLabel

[c0lt]

This is a followup to #130.

When using the DatePicker with InputGroup and FloatLabel, the DatePicker button is still visually separated from the DatePicker, when there's no InputGroupAddon to the right of it:

Reproducer

[mitsaucepls]

Hello, I second on this.
For me this issue raised not on the DatePicker component but on the AutoComplete component, when having multiple mode enabled. Back then I also created an issue inside the PrimeVue repository: primefaces/primevue#8298

I added my example to your reproducer:
https://stackblitz.com/edit/primevue-4-vite-issue-template-k1g7quhx?file=src%2FApp.vue