Settings API: Allow passing a class to `add_settings_field()` via the `$args` array.

While it's possible to target the wrapper element otherwise (currently a `tr`), this deficiency is made especially noticeable when custom code cannot take advantage of what core is doing, such as with avatars in #30168.

props valendesigns.
fixes #28975. see #30168.

Built from https://develop.svn.wordpress.org/trunk@31560


git-svn-id: http://core.svn.wordpress.org/trunk@31541 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/template.php

@@ -1289,11 +1289,20 @@ function do_settings_fields($page, $section) {
 		return;
 
 	foreach ( (array) $wp_settings_fields[$page][$section] as $field ) {
-		echo '<tr>';
-		if ( !empty($field['args']['label_for']) )
+		$class = '';
+
+		if ( ! empty( $field['args']['class'] ) ) {
+			$class = ' class="' . esc_attr( $field['args']['class'] ) . '"';
+		}
+
+		echo "<tr{$class}>";
+
+		if ( ! empty( $field['args']['label_for'] ) ) {
 			echo '<th scope="row"><label for="' . esc_attr( $field['args']['label_for'] ) . '">' . $field['title'] . '</label></th>';
-		else
+		} else {
 			echo '<th scope="row">' . $field['title'] . '</th>';
+		}
+
 		echo '<td>';
 		call_user_func($field['callback'], $field['args']);
 		echo '</td>';

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31559';
+$wp_version = '4.2-alpha-31560';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.