Fix Google Fonts missing font hinting info

Google fonts returns files that have the font hinting instructions
removed when the user agent is set as OSX. This is almost certainly due
to the fact that OSX disabled sub-pixel antialiasing by default back
with the release of Mojave.

Switching out the user agent for an equivalent windows one will ensure
that the font hinting is included, dramatically improving the rendering
of most fonts on 1x resolution screens where font hinting is enabled.

This seems to result in a roughly 20% increase in the size of the
fetched fonts.

Author: BenoitHiller

crates/next-core/src/next_font/google/mod.rs

@@ -65,7 +65,7 @@ pub const GOOGLE_FONTS_STYLESHEET_URL: &str = "https://fonts.googleapis.com/css2
 // Always sending this user agent ensures consistent results from Google Fonts.
 // Google Fonts will vary responses based on user agent, e.g. only returning
 // references to certain font types for certain browsers.
-pub const USER_AGENT_FOR_GOOGLE_FONTS: &str = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) \
+pub const USER_AGENT_FOR_GOOGLE_FONTS: &str = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) \
                                                AppleWebKit/537.36 (KHTML, like Gecko) \
                                                Chrome/104.0.0.0 Safari/537.36";
 

packages/font/src/google/fetch-resource.ts

@@ -24,7 +24,7 @@ export function fetchResource(
         headers: {
           // The file format is based off of the user agent, make sure woff2 files are fetched
           'User-Agent':
-            'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) ' +
+            'Mozilla/5.0 (Windows NT 10.0; Win64; x64) ' +
             'AppleWebKit/537.36 (KHTML, like Gecko) ' +
             'Chrome/104.0.0.0 Safari/537.36',
         },