Editor: add CSS var parsing for fontSize and fontFamily.

Adds capability to parse CSS custom properties for fontSize and fontFamily in `WP_Style_Engine`.

Props ramonopoly.
Fixes #59982.

Built from https://develop.svn.wordpress.org/trunk@57253


git-svn-id: http://core.svn.wordpress.org/trunk@56759 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/style-engine/class-wp-style-engine.php

@@ -215,6 +215,9 @@ final class WP_Style_Engine {
 					'default' => 'font-size',
 				),
 				'path'          => array( 'typography', 'fontSize' ),
+				'css_vars'      => array(
+					'font-size' => '--wp--preset--font-size--$slug',
+				),
 				'classnames'    => array(
 					'has-$slug-font-size' => 'font-size',
 				),
@@ -223,6 +226,9 @@ final class WP_Style_Engine {
 				'property_keys' => array(
 					'default' => 'font-family',
 				),
+				'css_vars'      => array(
+					'font-family' => '--wp--preset--font-family--$slug',
+				),
 				'path'          => array( 'typography', 'fontFamily' ),
 				'classnames'    => array(
 					'has-$slug-font-family' => 'font-family',

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-alpha-57252';
+$wp_version = '6.5-alpha-57253';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.