Deleting or creating settings.json in .vscode does not trigger onDidChangeConfiguration notification

[Colengms]

This is based on this symptom in the C/C++ Extension: microsoft/vscode-cpptools#5023

This is regarding settings.json in the .vscode subdirectory within an open folder.

If settings.json is edited, either within or externally from VS Code, we appear to get onDidChangeConfiguration. However, if the file is deleted, or created (one copied into place), we do not get onDidChangeConfiguration.

Likely unrelated, but: I also see that we are getting duplicate file watcher events for files within the .vscode subdirectory. We don't see duplicates for files in other subdirectories. I've repro'ed on both Windows and Linux.