From 96f963a2b9b8dd8cc8340df7e1432decc15134a7 Mon Sep 17 00:00:00 2001
From: noisysocks <noisysocks@git.wordpress.org>
Date: Thu, 1 Oct 2020 00:39:04 +0000
Subject: [PATCH] Editor: Add should_load_block_editor_scripts_and_styles

Adds a new should_load_block_editor_scripts_and_styles filter which can be used
by plugins including Gutenberg to more precisely customise when block editor
scripts and styles should be loaded by script-loader.php. Previously, plugins
had to fiddle with $current_screen->is_block_editor().

Props zieladam.
See #51330.

Built from https://develop.svn.wordpress.org/trunk@49080


git-svn-id: http://core.svn.wordpress.org/trunk@48842 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/script-loader.php | 34 ++++++++++++++++++++++++++++------
 wp-includes/version.php       |  2 +-
 2 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/wp-includes/script-loader.php b/wp-includes/script-loader.php
index 26f0a56782..72cc45d8a0 100644
--- a/wp-includes/script-loader.php
+++ b/wp-includes/script-loader.php
@@ -2160,9 +2160,7 @@ function script_concat_settings() {
  * @global WP_Screen $current_screen WordPress current screen object.
  */
 function wp_common_block_scripts_and_styles() {
-	global $current_screen;
-
-	if ( is_admin() && ( $current_screen instanceof WP_Screen ) && ! $current_screen->is_block_editor() ) {
+	if ( is_admin() && ! _should_load_block_editor_scripts_and_styles() ) {
 		return;
 	}
 
@@ -2185,6 +2183,30 @@ function wp_common_block_scripts_and_styles() {
 	do_action( 'enqueue_block_assets' );
 }
 
+/**
+ * Checks if the editor scripts and styles for all registered block types
+ * should be enqueued on the current screen.
+ *
+ * @access private
+ *
+ * @return boolean
+ */
+function _should_load_block_editor_scripts_and_styles() {
+	global $current_screen;
+
+	$is_block_editor_screen = ( $current_screen instanceof WP_Screen ) && $current_screen->is_block_editor();
+
+	/**
+	 * Filters the flag that decides whether or not block editor scripts and
+	 * styles are going to be enqueued on the current screen.
+	 *
+	 * @since 5.6.0
+	 *
+	 * @param boolean $is_block_editor_screen Current value of the flag
+	 */
+	return apply_filters( 'should_load_block_editor_scripts_and_styles', $is_block_editor_screen );
+}
+
 /**
  * Enqueues registered block scripts and styles, depending on current rendered
  * context (only enqueuing editor scripts while in context of the editor).
@@ -2196,7 +2218,7 @@ function wp_common_block_scripts_and_styles() {
 function wp_enqueue_registered_block_scripts_and_styles() {
 	global $current_screen;
 
-	$is_editor = ( ( $current_screen instanceof WP_Screen ) && $current_screen->is_block_editor() );
+	$load_editor_scripts = _should_load_block_editor_scripts_and_styles();
 
 	$block_registry = WP_Block_Type_Registry::get_instance();
 	foreach ( $block_registry->get_all_registered() as $block_name => $block_type ) {
@@ -2211,12 +2233,12 @@ function wp_enqueue_registered_block_scripts_and_styles() {
 		}
 
 		// Editor styles.
-		if ( $is_editor && ! empty( $block_type->editor_style ) ) {
+		if ( $load_editor_scripts && ! empty( $block_type->editor_style ) ) {
 			wp_enqueue_style( $block_type->editor_style );
 		}
 
 		// Editor script.
-		if ( $is_editor && ! empty( $block_type->editor_script ) ) {
+		if ( $load_editor_scripts && ! empty( $block_type->editor_script ) ) {
 			wp_enqueue_script( $block_type->editor_script );
 		}
 	}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 9bcc338b01..99493cdc0b 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-alpha-49079';
+$wp_version = '5.6-alpha-49080';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.