Type: LanguageService

Describe the bug

• OS and Version: OSX 10.14.5

• VS Code Version: 1.37.0-insider Commit: 6d82826e990407364d5c829b73602a19ecdf7d00

• C/C++ Extension Version: 0.24.1

• Other extensions you installed (and if the issue persists after disabling them): https://github.com/FractalBrew/vscode-mozillacpp

• A clear and concise description of what the bug is.

I have registered a custom configuration and it is correctly servicing requests for the configuration for .cpp files. However when I have a header file open I see no requests for the configuration for the header file and then the notification appears:

'Mozilla' is unable to provide IntelliSense configuration information for '/Users/dave/mozilla/source/trunk/dom/events/KeyEventHandler.h'. Settings from the 'Mac' configuration will be used instead.

To Reproduce

1. Have a source tree for Firefox built (sorry)
2. Install the referenced extension and select it as the configuration provider.
3. Set the extension's log level to "always" in settings.
4. Open a header file.
5. See error notification

Expected behavior
Expected to see the configuration provider called to ask for configuration for the header file.

Screenshots

Additional context