Lighting window is not closed after pressing quick button for auto-generate lighting at the bottom of the Editor window

Jira twin of: https://fogbugz.unity3d.com/f/cases/1291379/

How to reproduce

1. Open a new project
2. Press the "Auto Generate Lighting" quick button at the bottom right of the Editor
3. Press the same button again

Notes

• Expected result: The Lighting window closes
• Actual result: The Lighting window doesn't close
• Reproducible with: 2019.4.13f1, 2020.1.11f1, 2020.2.0b9, 2021.1.0a3
• Could not test with: 2018.4.28f1 (No quick buttons at the bottom right of the Editor)
• The Generate Lighting button reproduces in the mentioned versions in the Reproducible section