Font Library: Refactor as a singleton

[youknowriad]

What?

The FontLibrary class is basically a registry of font collections. And to map existing code style used for "registries" (block types, block patterns...) in Core, we're updating the class to use the singleton pattern rather than static methods.

No functional change here.

This backports a change from Core implemented in WordPress/wordpress-develop#6027

[github-actions]

This pull request has changed or added PHP files. Please confirm whether these changes need to be synced to WordPress Core, and therefore featured in the next release of WordPress.

If so, it is recommended to create a new Trac ticket and submit a pull request to the WordPress Core Github repository soon after this pull request is merged.

If you're unsure, you can always ask for help in the #core-editor channel in WordPress Slack.

Thank you! ❤️

View changed files

❔ lib/compat/wordpress-6.5/fonts/class-wp-font-library.php
❔ lib/compat/wordpress-6.5/fonts/class-wp-rest-font-collections-controller.php
❔ lib/compat/wordpress-6.5/fonts/fonts.php
❔ phpunit/tests/fonts/font-library/wpFontLibrary/base.php
❔ phpunit/tests/fonts/font-library/wpFontLibrary/getFontCollection.php
❔ phpunit/tests/fonts/font-library/wpFontLibrary/getFontCollections.php
❔ phpunit/tests/fonts/font-library/wpFontLibrary/registerFontCollection.php
❔ phpunit/tests/fonts/font-library/wpFontLibrary/unregisterFontCollection.php

[matiasbenedetto]

I tested that the font collections functionality still works as expected:
✔️ Collections API endpoints work as expected
✔️ Collections can be registered
✔️ Collections can be unregistered

LGTM

[github-actions]

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Props: youknowriad, mmaattiiaass.

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Co-authored-by: youknowriad <youknowriad@git.wordpress.org>
Co-authored-by: matiasbenedetto <mmaattiiaass@git.wordpress.org>

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