Linting errors are not cleared for deleted files

[tomasaschan]

Steps to reproduce:

1. Open a new VS Code instance with this extension installed in an empty folder
2. Create a file called Dockerfile, but don't add any contents. You (correctly) get a linting error stating No source image provided with FROM
3. Delete the Dockerfile

Expected behavior:

The linting error disappears from the Problems pane.

Actual behavior:

The linting error is still displayed.

Footnote:

According to the documentation for the language server protocol, it's up to the extension to clear out messages by pushing an empty array.

[rcjsuen]

@tlycken Thank you very much for your bug report. I have reproduced the problem.

I will have to figure out how to detect this deletion event in the language server.

[rcjsuen]

@tlycken I have opened rcjsuen/dockerfile-language-server#214 to capture this problem. I have also written up two proposed solutions there.

[rcjsuen]

@tlycken Thanks again for the bug report. This has been fixed in the 0.0.27 release.