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Fix: GSocketClient cannot proxy connect unless default port is explicitly specified in proxy URL

Michael Catanzaro requested to merge mcatanzaro/#2832 into main

Fix failure to respect default port of proxy URLs

Currently we require explicitly specifying the port when configuring a proxy server, which is seriously weird. I take the fact that nobody reported a bug until 2022 to indicate that almost nobody is using proxies. Whatever. Let's assume that if no port is provided, the default port for the protocol should be used instead.

For example, you can now specify in GNOME settings that your proxy server is https://example.com and it will work. Previously, you had to write https://example.com:443. Yuck!

This was originally reported as GProxyResolver bug, but nothing is actually wrong there. It's actually GProxyAddressEnumerator that gets tripped up by URLs returned by GProxyResolver without a default port. This breaks GSocketClient.

Fixing this requires exposing GUri's _default_scheme_port() function to GIO. I considered copy/pasting it since it's not very much code, but I figure the private call mechanism is probably not too expensive, and I don't like code duplication.

Fixes #2832 (closed)

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