From f69b784ec77f05cca1e3e9ce337f602b6752fd1a Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov.ru@gmail.com>
Date: Fri, 22 Sep 2017 17:35:48 +0000
Subject: [PATCH] Embeds: Introduce `embed_thumbnail_id` filter for thumbnail
 image ID in the embed template.

Props ketuchetan, Dency, jontyravi, Ov3rfly.
Fixes #39759.
Built from https://develop.svn.wordpress.org/trunk@41565


git-svn-id: http://core.svn.wordpress.org/trunk@41398 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/theme-compat/embed-content.php | 9 +++++++++
 wp-includes/version.php                    | 2 +-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/wp-includes/theme-compat/embed-content.php b/wp-includes/theme-compat/embed-content.php
index f706c6833d..c77026bd67 100644
--- a/wp-includes/theme-compat/embed-content.php
+++ b/wp-includes/theme-compat/embed-content.php
@@ -22,6 +22,15 @@
 			$thumbnail_id = get_the_ID();
 		}
 
+		/**
+		 * Filters the thumbnail image ID for use in the embed template.
+		 *
+		 * @since 4.9.0
+		 *
+		 * @param int $thumbnail_id Attachment ID.
+		 */
+		$thumbnail_id = apply_filters( 'embed_thumbnail_id', $thumbnail_id );
+
 		if ( $thumbnail_id ) {
 			$aspect_ratio = 1;
 			$measurements = array( 1, 1 );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 9097909683..1d561bbd10 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-alpha-41564';
+$wp_version = '4.9-alpha-41565';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.