Project settings search bar size changes on hovering when RenderObject is selected in the Project window.

Steps to repro:
1. Create a new URP template project
2. Edit > Project Settings > Docked the window.
3. Project > Click on "+" > Rendering > Universal Render Pipeline.
4. Forward Renderer > Select Forward Renderer object
5. Hover the mouse on Project Settings window.

Actual Result:
Project settings search bar size changes on hovering.

Expected Result:
Project settings search bar size should not change on hover.

Reproducible in:
2020.2.0a18, 2020.1.0b16, 2020.1.0b6 with 9.0.0, 8.2.0, 8.1.0.

Environment:
Occurring on Windows 10 & Mac 10.15.