URL: changes to file URL path normalization

[annevk]

See whatwg/url#544 and web-platform-tests/wpt#25716 for new tests.

cc @jasnell

[bmeck]

Will have to check if this messes with any existing stuff using the URL resolver

[watilde]

I implemented the updated logic of URL at #35477 and the below tests failed atm as they seem to be depending on URL:

• test/parallel/test-inspector-bindings.js
• test/parallel/test-inspector-multisession-js.js
• test/parallel/test-policy-dependencies.js
• test/parallel/test-policy-integrity-flag.js
• test/parallel/test-policy-scopes.js
• test/parallel/test-inspector-connect-main-thread.js
• test/parallel/test-worker-debug.js
• test/sequential/test-inspector.js
• test/sequential/test-inspector-break-when-eval.js
• test/sequential/test-inspector-debug-brk-flag.js
• test/sequential/test-inspector-exception.js
• test/sequential/test-inspector-resource-name-to-url.js

Full log: https://gist.github.com/watilde/ff9051a491cdfe0100f10cf525f7bed5

I'm figuring out how we can make them pass without breaking change in the existed modules other than URL. Any advice would be appreciated.

[guybedford]

@watilde if you can track down to what URL inputs and outputs those cases correspond to that would help a lot to determine if these changes should be considered breaking for the module system.

[watilde]

I just added a full log to my first comment. You can search by "Command:" to find failed cases.

[guybedford]

@watilde thanks, I already looked through them actually but couldn't see which URL calls they corresponded to without running the build myself hence my comment.

[watilde]

@guybedford Thank you for your help! To share where the errors happen, I investigated codes and could figure out how to fix them. Now the PR affects only whatwg-url :)

[guybedford]

Glad you have tracked it down and thanks for driving this important feedback which also affects Deno and other file-based module resolvers.