Packman: Scrolling with the mouse wheel up and down changes and UI windows

Steps to reproduce:

1. Open or create a project
2. Go to "Window" ->"Package Manager"
3. Add/dock a Pacman window next to the "Scene" and "Game" windows;
4. Adjust Pacman size so that the horizontal scroll bar would become visible
5. Try to scroll up and down in the list section by using a mouse wheel and observe how the UI changes

Expected result:  Only the packages list section should react to the scrolling.

Actual result: Scrolling with the wheel up and down changes Pacman UI - changes its sections. Video added in the "Attachments" section.

Reproducible with: 2023.2.0f1, 2023.3.0a14

Not reproducible with:

• 2023.1.20f1 Pacman doesn't have a vertical scrollbar in this stream.
• 2022.3.13f1 Pacman doesn't have a vertical scrollbar in this stream;
• 2021.3.32f1 Pacman doesn't have a vertical scrollbar in this stream.