Global styles revisions: update private methods to protected

[ramonopoly]

The private vars and methods in the Global styles revisions rest API controller should be changed to be protected.

Why? So class entities that inherit from the base can use them, and Gutenberg can iterate on 6.3 features without having to copy over private methods to new classes all the time.

It would be nice to have this in 6.3 as it would create a seamless compatibility with Gutenberg.

If judged not to be eligible, then we could probably work around it in Gutenberg until the next release.

Updates the private vars and methods in the Global styles revisions rest API controller to be protected.

Why? So class entities that inherit from the base can use them, and we can iterate on 6.3 features without having to copy over private methods to new classes all the time.

Gutenberg PR: ​https://github.com/WordPress/gutenberg/pull/52748

Trac ticket: https://core.trac.wordpress.org/ticket/58846

[audrasjb]

In 56268:

REST API: Update Global styles revisions private methods to protected.

This changeset updates the private vars and methods in the Global styles revisions rest API controller to be protected, so class entities that inherit
from the base can use them, and to allow iterating on 6.3 features without having to copy over private methods to new classes.

Props ramonopoly.
Fixes #58846.

committed in https://core.trac.wordpress.org/changeset/56268

[audrasjb]

Reopening for 6.3 backport, pending a second committer sign-off.

[ramonopoly]

Reopening for 6.3 backport, pending a second committer sign-off.

Thank you @audrasjb !

[spacedmonkey]

@audrasjb I am signing off.

[audrasjb]

Thank you @spacedmonkey ✌️

(tip: once you've signed-off, you can add the dev-reviewed keyword 🙂)

[audrasjb]

In 56275:

REST API: Update Global styles revisions private methods to protected.

This changeset updates the private vars and methods in the Global styles revisions rest API controller to be protected, so class entities that inherit
from the base can use them, and to allow iterating on 6.3 features without having to copy over private methods to new classes.

Props ramonopoly.
Reviewed by spacedmonkey.
Merges [56268] to the 6.3 branch.
Fixes #58846.