Block Editor: Add Global Settings support using theme.json file.

This is the first piece of landing the theme.json processing in WordPress core. 
It allows themes to configure the different editor settings, allow cusomizations and define presets in theme.json file.
 
Props jorgefilipecosta, nosolosw.
See #53175.

Built from https://develop.svn.wordpress.org/trunk@50959


git-svn-id: http://core.svn.wordpress.org/trunk@50568 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/block-editor.php

@@ -243,6 +243,50 @@ function get_block_editor_settings( $editor_name, $custom_settings = array() ) {
 		$custom_settings
 	);
 
+	$editor_settings['__experimentalFeatures'] = WP_Theme_JSON_Resolver::get_merged_data( $editor_settings )->get_settings();
+
+	// These settings may need to be updated based on data coming from theme.json sources.
+	if ( isset( $editor_settings['__experimentalFeatures']['color']['palette'] ) ) {
+		$editor_settings['colors'] = $editor_settings['__experimentalFeatures']['color']['palette'];
+		unset( $editor_settings['__experimentalFeatures']['color']['palette'] );
+	}
+	if ( isset( $editor_settings['__experimentalFeatures']['color']['gradients'] ) ) {
+		$editor_settings['gradients'] = $editor_settings['__experimentalFeatures']['color']['gradients'];
+		unset( $editor_settings['__experimentalFeatures']['color']['gradients'] );
+	}
+	if ( isset( $editor_settings['__experimentalFeatures']['color']['custom'] ) ) {
+		$editor_settings['disableCustomColors'] = $editor_settings['__experimentalFeatures']['color']['custom'];
+		unset( $editor_settings['__experimentalFeatures']['color']['custom'] );
+	}
+	if ( isset( $editor_settings['__experimentalFeatures']['color']['customGradient'] ) ) {
+		$editor_settings['disableCustomGradients'] = $editor_settings['__experimentalFeatures']['color']['customGradient'];
+		unset( $editor_settings['__experimentalFeatures']['color']['customGradient'] );
+	}
+	if ( isset( $editor_settings['__experimentalFeatures']['typography']['fontSizes'] ) ) {
+		$editor_settings['fontSizes'] = $editor_settings['__experimentalFeatures']['typography']['fontSizes'];
+		unset( $editor_settings['__experimentalFeatures']['typography']['fontSizes'] );
+	}
+	if ( isset( $editor_settings['__experimentalFeatures']['typography']['customFontSize'] ) ) {
+		$editor_settings['disableCustomFontSizes'] = $editor_settings['__experimentalFeatures']['typography']['customFontSize'];
+		unset( $editor_settings['__experimentalFeatures']['typography']['customFontSize'] );
+	}
+	if ( isset( $editor_settings['__experimentalFeatures']['typography']['customLineHeight'] ) ) {
+		$editor_settings['enableCustomLineHeight'] = $editor_settings['__experimentalFeatures']['typography']['customLineHeight'];
+		unset( $editor_settings['__experimentalFeatures']['typography']['customLineHeight'] );
+	}
+	if ( isset( $editor_settings['__experimentalFeatures']['spacing']['units'] ) ) {
+		if ( ! is_array( $editor_settings['__experimentalFeatures']['spacing']['units'] ) ) {
+			$editor_settings['enableCustomUnits'] = false;
+		} else {
+			$editor_settings['enableCustomUnits'] = count( $editor_settings['__experimentalFeatures']['spacing']['units'] ) > 0;
+		}
+		unset( $editor_settings['__experimentalFeatures']['spacing']['units'] );
+	}
+	if ( isset( $editor_settings['__experimentalFeatures']['spacing']['customPadding'] ) ) {
+		$editor_settings['enableCustomSpacing'] = $editor_settings['__experimentalFeatures']['spacing']['customPadding'];
+		unset( $editor_settings['__experimentalFeatures']['spacing']['customPadding'] );
+	}
+
 	/**
 	 * Filters the settings to pass to the block editor for all editor type.
 	 *