p-dropdown: when filtering, placeholder is displayed even if there is a selected option

[estellepicq]

Describe the bug

• p-dropdown uses [filter]="true" feature
• An option is already selected in the dropdown ✅
• The dropdown displays the selected option label ✅
• Open the overlay again to search for another option ✅
• Type in the filter input ✅
• The dropdown displays the placeholder above the selected option label ❌

It should keep displaying the selected option label.

Environment

PrimeNG official documentation: https://primeng.org/dropdown#filter

Reproducer

https://primeng.org/dropdown#filter

Angular version

17.0.0

PrimeNG version

17.0.0-rc.1

Build / Runtime

Angular CLI App

Language

TypeScript

Node version (for AoT issues node --version)

18.16.0

Browser(s)

No response

Steps to reproduce the behavior

• Select an option in the dropdown
• Open the overlay again to search for another option
• Type in the filter input

Expected behavior

Only the selected option label should be displayed.

I've forked and fixed it, let me know if you'd like a PR:

[abroekhuis]

I know this one is closed, but am wondering if this will be backported to a fix for version 16 as well. As can be seen on the version examples, the same problem occurs there.