Block Editor: Include the fixes targetted for WordPress 5.8 RC3.

This includes the following fixes:
 - Safari: see if compositing layer size is more reasonable when position fixed divs are not inserted into content.
 - Site Logo Block: update Site Logo block UI and option syncing.
 - Fix moving inner blocks in the Widgets Customizer.
 - Allow themes to provide empty values for color.duotone and spacing.units
 - Update getTermsInfo() to workaround parsing issue for translatable strings.
 - Specify what settings can be part of settings.layout.
 - Update conditions to hide duotone panel.
 - Prevent entering invalid values in the Query Loop block config.
 - Prevent color panel from showing as empty.
 - Avoid calling gutenberg_ functions within code shipped through WordPress Core.

Props desrosj.
See #53397.


git-svn-id: https://develop.svn.wordpress.org/trunk@51421 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-theme-json.php

@@ -181,6 +181,7 @@ class WP_Theme_JSON {
 	const ALLOWED_SETTINGS = array(
 		'color'      => array(
 			'custom'         => null,
+			'customDuotone'  => null,
 			'customGradient' => null,
 			'duotone'        => null,
 			'gradients'      => null,
@@ -188,7 +189,10 @@ class WP_Theme_JSON {
 			'palette'        => null,
 		),
 		'custom'     => null,
-		'layout'     => null,
+		'layout'     => array(
+			'contentSize' => null,
+			'wideSize'    => null,
+		),
 		'spacing'    => array(
 			'customMargin'  => null,
 			'customPadding' => null,