From 1be7c9356c4059fa87afdbc1f56742af53592197 Mon Sep 17 00:00:00 2001
From: Alex Lende <alex+github.com@lende.xyz>
Date: Thu, 18 Jan 2024 10:30:01 -0600
Subject: [PATCH] Backport WordPress/gutenberg#56661 - Add defaultFontSizes
 option to theme.json

---
 src/wp-includes/class-wp-theme-json.php | 29 +++++++++++++------------
 src/wp-includes/theme.json              |  1 +
 2 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/src/wp-includes/class-wp-theme-json.php b/src/wp-includes/class-wp-theme-json.php
index 37f4d11ce9fb4..876bd73b1eca3 100644
--- a/src/wp-includes/class-wp-theme-json.php
+++ b/src/wp-includes/class-wp-theme-json.php
@@ -151,7 +151,7 @@ class WP_Theme_JSON {
 		),
 		array(
 			'path'              => array( 'typography', 'fontSizes' ),
-			'prevent_override'  => false,
+			'prevent_override'  => array( 'typography', 'defaultFontSizes' ),
 			'use_default_names' => true,
 			'value_func'        => 'wp_get_typography_font_size_value',
 			'css_vars'          => '--wp--preset--font-size--$slug',
@@ -410,19 +410,20 @@ class WP_Theme_JSON {
 			'defaultPresets' => null,
 		),
 		'typography'                    => array(
-			'fluid'          => null,
-			'customFontSize' => null,
-			'dropCap'        => null,
-			'fontFamilies'   => null,
-			'fontSizes'      => null,
-			'fontStyle'      => null,
-			'fontWeight'     => null,
-			'letterSpacing'  => null,
-			'lineHeight'     => null,
-			'textColumns'    => null,
-			'textDecoration' => null,
-			'textTransform'  => null,
-			'writingMode'    => null,
+			'fluid'            => null,
+			'customFontSize'   => null,
+			'defaultFontSizes' => null,
+			'dropCap'          => null,
+			'fontFamilies'     => null,
+			'fontSizes'        => null,
+			'fontStyle'        => null,
+			'fontWeight'       => null,
+			'letterSpacing'    => null,
+			'lineHeight'       => null,
+			'textColumns'      => null,
+			'textDecoration'   => null,
+			'textTransform'    => null,
+			'writingMode'      => null,
 		),
 	);
 
diff --git a/src/wp-includes/theme.json b/src/wp-includes/theme.json
index f2690bd44dfeb..62d3ff6373d06 100644
--- a/src/wp-includes/theme.json
+++ b/src/wp-includes/theme.json
@@ -235,6 +235,7 @@
 		},
 		"typography": {
 			"customFontSize": true,
+			"defaultFontSizes": true,
 			"dropCap": true,
 			"fontSizes": [
 				{