Black sometimes adds two newlines at the end of file and doesn't remove it by itself on reformatting

[Kushagra-0801]

Operating System: Ubuntu 19.04
Python version: 3.7.4
Black version: 19.3b0
Editor: VS Code (snap)
Happens on the branch installed by pip
Black sometimes adds an extra newline at the end of the file (mostly when there already is a newline there, I think). The newline is not removed on reformatting. Once I remove it, it doesn't happen again.
It doesn't happen a lot so I haven't seen any clear pattern to it.

[JelleZijlstra]

Could you give an example that reproduces this bug?

I wonder if this could be a bug in your editor integration or IDE.

[ichard26]

This is most likely a bug with Visual Studio Code Python extension's diff handling. The (highly likely) duplicate issue of this issue has linked this: microsoft/vscode-python#11001.

[JelleZijlstra]

Seems unlikely that this is a bug in Black. Closing in favor of the VSCode issue.