`wp_delete_post()`: add a filter, 'pre_delete_post', to allow bailout from the function if the filter returns a non-null value.

Props boonebgorges.
Fixes #32933.

Built from https://develop.svn.wordpress.org/trunk@34082


git-svn-id: http://core.svn.wordpress.org/trunk@34050 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post-functions.php

@@ -2317,6 +2317,20 @@ function wp_delete_post( $postid = 0, $force_delete = false ) {
 	if ( $post->post_type == 'attachment' )
 		return wp_delete_attachment( $postid, $force_delete );
 
+	/**
+	 * Filter whether a post deletion should take place.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param bool    $delete       Whether to go forward with deletion.
+	 * @param WP_Post $post         Post object.
+	 * @param bool    $force_delete Whether to bypass the trash.
+	 */
+	$check = apply_filters( 'pre_delete_post', null, $post, $force_delete );
+	if ( null !== $check ) {
+		return $check;
+	}
+
 	/**
 	 * Fires before a post is deleted, at the start of wp_delete_post().
 	 *

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34081';
+$wp_version = '4.4-alpha-34082';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.