Fix relative path of glob patterns when config is provided via the --config CLI option

[akijoey]

What is the problem you're trying to solve?

Following on #5604 (comment).

I think the glob patterns should be relative to the current working directory when config is provided via the --config CLI option.

Just like ESLint.

What solution would you like to see?

If a config is provided via the --config CLI option, the glob patterns in the config are relative to the current working directory rather than the base directory of the given config.

[0liver]

Absolutely! 😁

[jeddy3]

I assume changing the default behaviour would be a breaking change? It's unlikely we'll do a major release any time soon, as they are painful for the community, but we could an option to trigger this behaviour (and then make it the default in the next major release). Something like --use-cwd?