Proxy configuration doesn't allow URLs with port number AND pac files

<!-- Please search existing issues to avoid creating duplicates. --> <!-- Also please test using the latest insiders build to make sure your issue has not already been fixed: https://code.visualstudio.com/insiders/ --> <!-- Use Help > Report Issue to prefill these. --> - VSCode Version: 1.40.2 (user setup) - OS Version: Windows_NT x64 10.0.18362 Steps to Reproduce: 1.` File` -> `Preferences` -> `Settings`-> `Application`-> `Proxy` 2. Under `Proxy` try entering URL `https://user:password@proxyurl.com:8080/file.pac` 3. Error message appears: `Value must match regex `a regex`.  4. Both PAC file `https://user:password@proxyurl.com/file.pac` and port `https://user:password@proxyurl.com:8080` work independently, but not together. <!-- Launch with `code --disable-extensions` to check. --> Does this issue occur when all extensions are disabled?: Yes/No