Ticket #32810: 32810.4.diff

src/wp-admin/css/customize-nav-menus.css

@@ -651 +651 @@
         box-shadow: 0 0 0 1px #5b9dd9, 0 0 2px 1px rgba(30, 140, 190, .8);
 }
 
+#available-menu-items .accordion-section-title .no-items {
+        display: none;
+}
+
+#available-menu-items .cannot-expand .accordion-section-title {
+        background: transparent;
+        color: #777;
+}
+
+#available-menu-items .cannot-expand .accordion-section-title .no-items {
+        display: inline-block;
+        color: #82878c;
+        font-weight: normal;
+        position: absolute;
+        right: 15px;
+        top: 13px;
+}
+
 #available-menu-items .accordion-section-content {
         padding: 1px 15px 15px 15px;
         margin: 0;

src/wp-admin/js/customize-nav-menus.js

@@ -316 +316 @@
                                 var items, typeInner;
                                 items = data.items;
                                 if ( 0 === items.length ) {
+                                        if ( 0 === self.pages[type] ) {
+                                                $( '#available-menu-items-' + type ).addClass( 'cannot-expand' )
+                                                                                    .removeClass( 'loading' );
+                                        }
                                         self.pages[ type ] = -1;
                                         return;
                                 }

src/wp-includes/class-wp-customize-nav-menus.php

@@ -698 +698 @@
                                 foreach ( $post_types as $type ) :
                                         ?>
                                         <div id="available-menu-items-<?php echo esc_attr( $type->name ); ?>" class="accordion-section">
-                                                <h4 class="accordion-section-title"><?php echo esc_html( $type->label ); ?> <span class="spinner"></span> <button type="button" class="not-a-button"><span class="screen-reader-text"><?php _e( 'Toggle' ); ?></span></button></h4>
+                                                <h4 class="accordion-section-title"><?php echo esc_html( $type->label ); ?> <span class="spinner"></span> <span class="no-items"><?php _e( 'No items' ); ?></span> <button type="button" class="not-a-button"><span class="screen-reader-text"><?php _e( 'Toggle' ); ?></span></button></h4>
                                                 <ul class="accordion-section-content" data-type="<?php echo esc_attr( $type->name ); ?>" data-obj_type="post_type"></ul>
                                         </div>
                                 <?php
@@ -710 +710 @@
                                 foreach ( $taxonomies as $tax ) :
                                         ?>
                                         <div id="available-menu-items-<?php echo esc_attr( $tax->name ); ?>" class="accordion-section">
-                                                <h4 class="accordion-section-title"><?php echo esc_html( $tax->label ); ?> <span class="spinner"></span> <button type="button" class="not-a-button"><span class="screen-reader-text"><?php _e( 'Toggle' ); ?></span></button></h4>
+                                                <h4 class="accordion-section-title"><?php echo esc_html( $tax->label ); ?> <span class="spinner"></span> <span class="no-items"><?php _e( 'No items' ); ?></span> <button type="button" class="not-a-button"><span class="screen-reader-text"><?php _e( 'Toggle' ); ?></span></button></h4>
                                                 <ul class="accordion-section-content" data-type="<?php echo esc_attr( $tax->name ); ?>" data-obj_type="taxonomy"></ul>
                                         </div>
                                 <?php