Rubocop linter stops working after reopening a file #373

Your environment

• vscode-ruby version: 0.19.0
• Ruby version: 2.5.1
• VS Code version: 1.25.1
• Operating System: macOS High Sierra
• Hardware (optional): Macbook Pro 2016

Make sure you have ruby, ruby-debug-ide and ruby-debug-basex19 installed before submitting your issue -- thank you ! ✅

Expected behavior

Keeps linting after closing and reopening the same file

Actual behavior

Linting breaks:

• existing lint issues are not disappearing after getting fixed (still underlined and displayed in problems tab)
• new lint issues not detected and marked

Steps to reproduce the problem

1. Make a styling offense
2. Wait for it to be marked
3. Save the file
4. Close the file
5. Reopen the file (reopen last shortcut/file explorer/ctrlp - doesn't matter)
6. Fix the offense
7. Wait/save
8. Linter underlines correct code where the former offences were present
9. Reload window to make it work again

Before reopening:

After: