diff -r 34716fd837a4 -r be944660c56a wp/wp-includes/block-supports/colors.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/block-supports/colors.php	Wed Sep 21 18:19:35 2022 +0200
@@ -0,0 +1,159 @@
+<?php
+/**
+ * Colors block support flag.
+ *
+ * @package WordPress
+ * @since 5.6.0
+ */
+
+/**
+ * Registers the style and colors block attributes for block types that support it.
+ *
+ * @since 5.6.0
+ * @access private
+ *
+ * @param WP_Block_Type $block_type Block Type.
+ */
+function wp_register_colors_support( $block_type ) {
+	$color_support = false;
+	if ( property_exists( $block_type, 'supports' ) ) {
+		$color_support = _wp_array_get( $block_type->supports, array( 'color' ), false );
+	}
+	$has_text_colors_support       = true === $color_support || ( is_array( $color_support ) && _wp_array_get( $color_support, array( 'text' ), true ) );
+	$has_background_colors_support = true === $color_support || ( is_array( $color_support ) && _wp_array_get( $color_support, array( 'background' ), true ) );
+	$has_gradients_support         = _wp_array_get( $color_support, array( 'gradients' ), false );
+	$has_link_colors_support       = _wp_array_get( $color_support, array( 'link' ), false );
+	$has_color_support             = $has_text_colors_support ||
+		$has_background_colors_support ||
+		$has_gradients_support ||
+		$has_link_colors_support;
+
+	if ( ! $block_type->attributes ) {
+		$block_type->attributes = array();
+	}
+
+	if ( $has_color_support && ! array_key_exists( 'style', $block_type->attributes ) ) {
+		$block_type->attributes['style'] = array(
+			'type' => 'object',
+		);
+	}
+
+	if ( $has_background_colors_support && ! array_key_exists( 'backgroundColor', $block_type->attributes ) ) {
+		$block_type->attributes['backgroundColor'] = array(
+			'type' => 'string',
+		);
+	}
+
+	if ( $has_text_colors_support && ! array_key_exists( 'textColor', $block_type->attributes ) ) {
+		$block_type->attributes['textColor'] = array(
+			'type' => 'string',
+		);
+	}
+
+	if ( $has_gradients_support && ! array_key_exists( 'gradient', $block_type->attributes ) ) {
+		$block_type->attributes['gradient'] = array(
+			'type' => 'string',
+		);
+	}
+}
+
+
+/**
+ * Add CSS classes and inline styles for colors to the incoming attributes array.
+ * This will be applied to the block markup in the front-end.
+ *
+ * @since 5.6.0
+ * @access private
+ *
+ * @param  WP_Block_Type $block_type       Block type.
+ * @param  array         $block_attributes Block attributes.
+ *
+ * @return array Colors CSS classes and inline styles.
+ */
+function wp_apply_colors_support( $block_type, $block_attributes ) {
+	$color_support = _wp_array_get( $block_type->supports, array( 'color' ), false );
+
+	if (
+		is_array( $color_support ) &&
+		array_key_exists( '__experimentalSkipSerialization', $color_support ) &&
+		$color_support['__experimentalSkipSerialization']
+	) {
+		return array();
+	}
+
+	$has_text_colors_support       = true === $color_support || ( is_array( $color_support ) && _wp_array_get( $color_support, array( 'text' ), true ) );
+	$has_background_colors_support = true === $color_support || ( is_array( $color_support ) && _wp_array_get( $color_support, array( 'background' ), true ) );
+	$has_gradients_support         = _wp_array_get( $color_support, array( 'gradients' ), false );
+	$classes                       = array();
+	$styles                        = array();
+
+	// Text colors.
+	// Check support for text colors.
+	if ( $has_text_colors_support ) {
+		$has_named_text_color  = array_key_exists( 'textColor', $block_attributes );
+		$has_custom_text_color = isset( $block_attributes['style']['color']['text'] );
+
+		// Apply required generic class.
+		if ( $has_custom_text_color || $has_named_text_color ) {
+			$classes[] = 'has-text-color';
+		}
+		// Apply color class or inline style.
+		if ( $has_named_text_color ) {
+			$classes[] = sprintf( 'has-%s-color', $block_attributes['textColor'] );
+		} elseif ( $has_custom_text_color ) {
+			$styles[] = sprintf( 'color: %s;', $block_attributes['style']['color']['text'] );
+		}
+	}
+
+	// Background colors.
+	if ( $has_background_colors_support ) {
+		$has_named_background_color  = array_key_exists( 'backgroundColor', $block_attributes );
+		$has_custom_background_color = isset( $block_attributes['style']['color']['background'] );
+
+		// Apply required background class.
+		if ( $has_custom_background_color || $has_named_background_color ) {
+			$classes[] = 'has-background';
+		}
+		// Apply background color classes or styles.
+		if ( $has_named_background_color ) {
+			$classes[] = sprintf( 'has-%s-background-color', $block_attributes['backgroundColor'] );
+		} elseif ( $has_custom_background_color ) {
+			$styles[] = sprintf( 'background-color: %s;', $block_attributes['style']['color']['background'] );
+		}
+	}
+
+	// Gradients.
+	if ( $has_gradients_support ) {
+		$has_named_gradient  = array_key_exists( 'gradient', $block_attributes );
+		$has_custom_gradient = isset( $block_attributes['style']['color']['gradient'] );
+
+		if ( $has_named_gradient || $has_custom_gradient ) {
+			$classes[] = 'has-background';
+		}
+		// Apply required background class.
+		if ( $has_named_gradient ) {
+			$classes[] = sprintf( 'has-%s-gradient-background', $block_attributes['gradient'] );
+		} elseif ( $has_custom_gradient ) {
+			$styles[] = sprintf( 'background: %s;', $block_attributes['style']['color']['gradient'] );
+		}
+	}
+
+	$attributes = array();
+	if ( ! empty( $classes ) ) {
+		$attributes['class'] = implode( ' ', $classes );
+	}
+	if ( ! empty( $styles ) ) {
+		$attributes['style'] = implode( ' ', $styles );
+	}
+
+	return $attributes;
+}
+
+// Register the block support.
+WP_Block_Supports::get_instance()->register(
+	'colors',
+	array(
+		'register_attribute' => 'wp_register_colors_support',
+		'apply'              => 'wp_apply_colors_support',
+	)
+);