Media: In `wp_read_image_metadata()` make sure that IPTC keywords are UTF8 encoded.

Prevents missing `_wp_attachment_metadata` when an image contains keywords with latin extended characters.

Fixes #35316.
Built from https://develop.svn.wordpress.org/trunk@36429


git-svn-id: http://core.svn.wordpress.org/trunk@36396 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/image.php

@@ -408,12 +408,14 @@ function wp_read_image_metadata( $file ) {
 		}
 	}
 
-	foreach ( $meta as &$value ) {
-		if ( is_string( $value ) ) {
-			$value = wp_kses_post( $value );
+	foreach ( $meta['keywords'] as $key => $keyword ) {
+		if ( ! seems_utf8( $keyword ) ) {
+			$meta['keywords'][ $key ] = utf8_encode( $keyword );
 		}
 	}
 
+	$meta = wp_kses_post_deep( $meta );
+
 	/**
 	 * Filter the array of meta data read from an image's exif data.
 	 *

wp-includes/kses.php

@@ -1581,6 +1581,19 @@ function wp_kses_post( $data ) {
 	return wp_kses( $data, 'post' );
 }
 
+/**
+ * Navigates through an array, object, or scalar, and sanitizes content for
+ * allowed HTML tags for post content.
+ *
+ * @since 4.4.2
+ *
+ * @param mixed $value The array or string to filter.
+ * @return mixed $value The filtered content.
+ */
+function wp_kses_post_deep( $data ) {
+	return map_deep( $data, 'wp_kses_post' );
+}
+
 /**
  * Strips all of the HTML in the content.
  *

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-alpha-36427';
+$wp_version = '4.5-alpha-36429';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.