On selecting options in the "Search Filter Window" panel, background window properties get highlighted, refer attached video.

Steps to repro:
1. Create a new project
2. Window > Package Manager > Quick Search > Install
3. Help > Quick Search (Alt + ')
4. Open "Filter Panel (Click on search icon)"
5. Hover mouse on options OR select any options

Actual Result:
Properties of the background window get highlighted on hovering mouse on options in the "Search Filter" panel

Expected Result:
While selecting options in the "Search Filter" panel, background windows properties are doesn't get highlighted. The editor focuses is completely on the "Search Filter" panel

Tested with Unity version:
2020.1.0a17, 2019.3.0f3

Reproducible with package version: preview.2 - 1.5.0, 1.4.1, preview - 1.3.0, preview - 1.2.0, preview.1 - 1.1.0

Working fine with package version: preview.1 - 1.0.1, preview.2 - 1.0.0

Environment:
Windows 10 and macOS 10.14