Media: Render attachment custom fields for new uploads.

Initialize attachment custom fields during the `add` callback, so that fields are present as soon as an attachment is uploaded but do not refresh when field values are changed. Follow up to #40909.

Props trepmal, adamsilverstein, joedolson.
Fixes #58051.
Built from https://develop.svn.wordpress.org/trunk@55649


git-svn-id: http://core.svn.wordpress.org/trunk@55161 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/media-views.js

@@ -2464,6 +2464,11 @@ AttachmentCompat = View.extend(/** @lends wp.media.view.AttachmentCompat.prototy
 		'change textarea': 'save'
 	},
 
+	initialize: function() {
+		// Render the view when a new item is added.
+		this.listenTo( this.model, 'add', this.render );
+	},
+
 	/**
 	 * @return {wp.media.view.AttachmentCompat} Returns itself to allow chaining.
 	 */

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-55648';
+$wp_version = '6.3-alpha-55649';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.