Customizer: Mixed priority sorting for panels and top-level sections.

props celloexpressions.
fixes #28979.

Built from https://develop.svn.wordpress.org/trunk@29488


git-svn-id: http://core.svn.wordpress.org/trunk@29266 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/customize.php

@@ -161,11 +161,8 @@ do_action( 'customize_controls_print_scripts' );
 
 			<div id="customize-theme-controls"><ul>
 				<?php
-				foreach ( $wp_customize->panels() as $panel ) {
-					$panel->maybe_render();
-				}
-				foreach ( $wp_customize->sections() as $section ) {
-					$section->maybe_render();
+				foreach ( $wp_customize->containers() as $container ) {
+					$container->maybe_render();
 				}
 				?>
 			</ul></div>