Diagnostics for closed files still remain in "Problems" tab

[KevinEady]

Describe the bug

When opening a file with diagnostics, the problems are displayed on the "Problems" tab in the editor. However, closing the file does not remove the entries from the "Problems" tab.

To Reproduce

Steps to reproduce the behavior:

1. Open a GitHub Actions .yml file that has diagnostics.
2. Close file.

Expected behavior

The diagnostics are removed from the "Problems" tab.

Screenshots

old-push-diagnostics.mp4

Package/Area

• Language Server

Package Version

v0.3.11