[json] schema validation in a folder of a workspace stops working when more folders are added to it

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.66.2 (Tested in Insiders 1.67.0 with same results)
• OS Version: Windows 10 Education N x64 - 21H1

Steps to Reproduce:

1. Create a Workspace and add a simple folder with a schema for JSON files defined in the folder settings.

schema-file.json

{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "title": "Test",
    "description": "An example schema",
    "type": "object",
    "properties": {
        "requiredProperty": {
            "type": "string"
        }
    },
    "required": [
        "requiredProperty"
    ]
}

1. Check that the test.json file is being validated correctly.

2. Add a second folder to the workspace. In my test I added an empty folder in the same root as the workspace. The validation still works as expected.

3. Reload the window or close/open VSCode. The schema validation has stopped working as if the file did not match the fileMatch in the folder settings. Removing the second folder and reloading makes it work again.

As a note, if you open folder-A directly in VSCode rather than the workspace, the validation works as expected.

[GabenGar]

I noticed this is OS-specific too. On ubuntu 22 machine multi-root validation works fine but on windows 10 machine it doesn’t, on the same codebase.

[MrVauxs]

@ajcool2k Looks fixed in vscode-insiders 1.71

Still have the bug on 1.71 on my machine.

Top: Workspace, Bottom: Folder