FileSystemProvider: watcher is being called for in-workspace files

[bpasero]

Refs: #48421

Setup:

• clone https://github.com/bpasero/remote-fs
• F5
• click "Refresh" in the explorer
• you should see the current working directory as a remote folder using the file system provider for scheme datei://

Steps

• add a breakpoint to the watch method
• open a file that is within the workspace

=> the watcher method is called for this file even though it is within the workspace and so I would expect this not to be called and instead be covered by the (recursive) folder watcher

Could be related to #48666

[jrieken]

the watcher method is called for this file even though it is within the workspace an

Cannot reproduce, please show me. The current, expected behaviour is that it's called for the workspace and files outside the workspace

[bpasero]

Issue was with my workspace file.