Test output has strange indentation when using \n as the EOL

[jdneo]

Does this issue occur when all extensions are disabled?: Yes/No

Version: 1.57.0-insider (user setup)
Commit: 5319757
Date: 2021-05-24T05:14:19.500Z
Electron: 12.0.7
Chrome: 89.0.4389.128
Node.js: 14.16.0
V8: 8.9.255.25-electron.0
OS: Windows_NT x64 10.0.19043

Steps to Reproduce:

1. Using the test-provider-sample project
2. Update the method invocation of appendOutput(), use just \n as the EOL
3. The output indentation looks strange. If using \r\n, it looks as expected

// cc @connor4312

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Cannot toggle the test hide status (#124544)

[connor4312]

The output is displayed as terminal output; \n only moves the cursor down a line, you want to use \r too in order to reset its position (\r\n)