Customize: Add rightward-facing back button to Themes section header to improve navigation (since the section slides in from the left).

Also serves to prototype for an upward-facing arrow in this location for a Publish Settings section.

Props melchoyce, westonruter.
See #39896, #40278, #21666.

Built from https://develop.svn.wordpress.org/trunk@41368


git-svn-id: http://core.svn.wordpress.org/trunk@41201 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/customize-controls-rtl.css

@@ -1168,6 +1168,21 @@ p.customize-section-description {
 	border-right: none;
 	margin-top: 0;
 }
+#customize-theme-controls .control-section-themes .customize-section-back {
+	position: absolute;
+	left: 0;
+	top: 0;
+	height: 80px;
+	border-right: 1px solid #ddd;
+	border-left: 4px solid #fff;
+}
+#customize-theme-controls .control-section-themes .customize-section-back:before {
+	content: "\f341";
+}
+#customize-theme-controls .control-section-themes .customize-section-back:hover,
+#customize-theme-controls .control-section-themes .customize-section-back:focus {
+	border-left-color: #0073aa;
+}
 
 #customize-theme-controls .control-section-themes .customize-themes-panel .accordion-section-title:first-child:hover, /* Not a focusable element. */
 #customize-theme-controls .control-section-themes .customize-themes-panel .accordion-section-title:first-child {

wp-admin/css/customize-controls.css

@@ -1168,6 +1168,21 @@ p.customize-section-description {
 	border-left: none;
 	margin-top: 0;
 }
+#customize-theme-controls .control-section-themes .customize-section-back {
+	position: absolute;
+	right: 0;
+	top: 0;
+	height: 80px;
+	border-left: 1px solid #ddd;
+	border-right: 4px solid #fff;
+}
+#customize-theme-controls .control-section-themes .customize-section-back:before {
+	content: "\f345";
+}
+#customize-theme-controls .control-section-themes .customize-section-back:hover,
+#customize-theme-controls .control-section-themes .customize-section-back:focus {
+	border-right-color: #0073aa;
+}
 
 #customize-theme-controls .control-section-themes .customize-themes-panel .accordion-section-title:first-child:hover, /* Not a focusable element. */
 #customize-theme-controls .control-section-themes .customize-themes-panel .accordion-section-title:first-child {

wp-admin/js/customize-controls.js

@@ -1164,6 +1164,15 @@
 		attachEvents: function () {
 			var section = this;
 
+			// Expand/Collapse accordion sections on click.
+			section.container.find( '.customize-section-back' ).on( 'click keydown', function( event ) {
+				if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
+					return;
+				}
+				event.preventDefault(); // Keep this AFTER the key filter above
+				section.collapse();
+			});
+
 			// Expand/Collapse section/panel.
 			section.container.find( '.change-theme, .customize-theme' ).on( 'click keydown', function( event ) {
 				if ( api.utils.isKeydownButNotEnterEvent( event ) ) {

wp-includes/customize/class-wp-customize-themes-section.php

@@ -50,6 +50,7 @@ class WP_Customize_Themes_Section extends WP_Customize_Section {
 			</h3>
 			<div class="customize-themes-panel control-panel-content themes-php">
 				<h3 class="accordion-section-title customize-section-title">
+					<button class="customize-section-back" tabindex="0" type="button"><span class="screen-reader-text"><?php _e( 'Back' ); ?></span></button>
 					<span class="customize-action"><?php _e( 'Customizing' ); ?></span>
 					<?php _e( 'Themes' ); ?>
 					<span class="title-count theme-count"><?php echo count( $this->controls ) + 1 /* Active theme */; ?></span>

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-alpha-41367';
+$wp_version = '4.9-alpha-41368';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.