Issue #2078951 by tim.plunkett, jessebeach: Highlight the row of block that was just placed.

core/modules/block/css/block.admin.css

@@ -55,6 +55,9 @@ a.block-demo-backlink:hover {
 .block-list-secondary .form-type-search {
   padding: 0 1em;
 }
+#block-placed {
+  background-color: #ffd;
+}
 
 /* Wide screens */
 @media

core/modules/block/js/block.admin.js

@@ -68,4 +68,22 @@ Drupal.behaviors.blockFilterByText = {
   }
 };
 
+/**
+ * Highlights the block that was just placed into the block listing.
+ */
+Drupal.behaviors.blockHighlightPlacement = {
+  attach: function (context, settings) {
+    if (settings.blockPlacement) {
+      $('#blocks').once('block-highlight', function () {
+        var $container = $(this);
+        // Just scrolling the document.body will not work in Firefox. The html
+        // element is needed as well.
+        $('html, body').animate({
+          scrollTop: $('#block-placed').offset().top - $container.offset().top + $container.scrollTop()
+        }, 500);
+      });
+    }
+  }
+};
+
 }(jQuery, Drupal));

core/modules/block/lib/Drupal/block/BlockFormController.php

@@ -293,7 +293,9 @@ public function submit(array $form, array &$form_state) {
 
     drupal_set_message($this->t('The block configuration has been saved.'));
     Cache::invalidateTags(array('content' => TRUE));
-    $form_state['redirect'] = 'admin/structure/block/list/' . $entity->get('theme');
+    $form_state['redirect'] = array('admin/structure/block/list/' . $entity->get('theme'), array(
+      'query' => array('block-placement' => drupal_html_class($this->entity->id())),
+    ));
   }
 
   /**

core/modules/block/lib/Drupal/block/BlockListController.php

@@ -16,6 +16,7 @@
 use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\Form\FormInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpFoundation\Request;
 
 /**
  * Defines the block list controller.
@@ -36,6 +37,13 @@ class BlockListController extends ConfigEntityListController implements FormInte
    */
   protected $theme;
 
+  /**
+   * The current request.
+   *
+   * @var \Symfony\Component\HttpFoundation\Request
+   */
+  protected $request;
+
   /**
    * The block manager.
    *
@@ -98,8 +106,18 @@ public function load() {
 
   /**
    * Overrides \Drupal\Core\Entity\EntityListController::render().
+   *
+   * @param string|null $theme
+   *   (optional) The theme to display the blocks for. If NULL, the current
+   *   theme will be used.
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The current request.
+   *
+   * @return array
+   *   The block list as a renderable array.
    */
-  public function render($theme = NULL) {
+  public function render($theme = NULL, Request $request = NULL) {
+    $this->request = $request;
     // If no theme was specified, use the current theme.
     $this->theme = $theme ?: $GLOBALS['theme_key'];
 
@@ -119,6 +137,14 @@ public function getFormID() {
    * Form constructor for the main block administration form.
    */
   public function buildForm(array $form, array &$form_state) {
+    $placement = FALSE;
+    if ($this->request->query->has('block-placement')) {
+      $placement = $this->request->query->get('block-placement');
+      $form['#attached']['js'][] = array(
+        'type' => 'setting',
+        'data' => array('blockPlacement' => $placement),
+      );
+    }
     $entities = $this->load();
     $form['#theme'] = array('block_list');
     $form['#attached']['library'][] = array('system', 'drupal.tableheader');
@@ -222,6 +248,9 @@ public function buildForm(array $form, array &$form_state) {
               'class' => array('draggable'),
             ),
           );
+          if ($placement && $placement == drupal_html_class($entity_id)) {
+            $form['blocks'][$entity_id]['#attributes']['id'] = 'block-placed';
+          }
 
           $form['blocks'][$entity_id]['info'] = array(
             '#markup' => check_plain($info['admin_label']),

core/modules/block/lib/Drupal/block/Controller/BlockListController.php

@@ -9,6 +9,7 @@
 
 use Drupal\Core\Entity\Controller\EntityListController;
 use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpFoundation\Request;
 
 /**
  * Defines a controller to list blocks.
@@ -20,13 +21,15 @@ class BlockListController extends EntityListController {
    *
    * @param string|null $theme
    *   Theme key of block list.
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The current request.
    *
    * @return array
    *   A render array as expected by drupal_render().
    */
-  public function listing($theme = NULL) {
+  public function listing($theme = NULL, Request $request = NULL) {
     $theme = $theme ?: $this->config('system.theme')->get('default');
-    return $this->entityManager()->getListController('block')->render($theme);
+    return $this->entityManager()->getListController('block')->render($theme, $request);
   }
 
 }