[ListComponentBase] Fix #3029 invoke ValueChanged when initially selecting an option

[pk9r]

Pull Request

📖 Description

Fix 3029, Combobox no longer causes the page to become unresponsive.

#3029 (comment)

🎫 Issues

#3029

👩‍💻 Reviewer Notes

📑 Test Plan

✅ Checklist

General

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

• I have added a new component
• I have added Unit Tests for my new component
• I have modified an existing component
• I have validated the Unit Tests for an existing component

⏭ Next Steps

The displayed value of the combobox is not consistent with its value. I have no idea how to solve this.