How to reproduce:
1. Create a new project in your preferred workspace and open it
2. Connect it to Perforce
3. Open the VCS Window (Project Settings assets should be automatically added to the VCS Window)
4. While one of the files is selected click the refresh button and while VCS is still being refreshed try to navigate the list with the arrow keys
5. Observe the console

Expected result: the list is not navigatable while VCS is being refreshed and no errors are thrown
Actual result: the list is navigatable while VCS is being refreshed and errors are thrown when trying to do so

Reproduced in: 2020.1.0a3, 2019.3.0b2, 2019.3.0a3
Not reproducible: 2019.3.0a2, 2019.3.0a1, 2019.2.3f1, 2018.4.7f1, 2017.4.32f1 (Due to VCS Window refresh working differently in these versions)