Issue #2156351 by olli: Unable to delete block.

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

@@ -350,6 +350,11 @@ public function delete(array $form, array &$form_state) {
         'block' => $this->entity->id(),
       ),
     );
+    $query = $this->getRequest()->query;
+    if ($query->has('destination')) {
+      $form_state['redirect_route']['options']['query']['destination'] = $query->get('destination');
+      $query->remove('destination');
+    }
   }
 
   /**

core/modules/block/lib/Drupal/block/Tests/BlockTest.php

@@ -141,6 +141,16 @@ function testBlock() {
     $this->assertRaw(t('Are you sure you want to delete the block %name?', array('%name' => $block['settings[label]'])));
     $this->drupalPostForm(NULL, array(), t('Delete'));
     $this->assertRaw(t('The block %name has been removed.', array('%name' => $block['settings[label]'])));
+
+    // Test deleting a block via "Configure block" link.
+    $block = $this->drupalPlaceBlock('system_powered_by_block');
+    $this->drupalGet('admin/structure/block/manage/' . $block->id(), array('query' => array('destination' => 'admin')));
+    $this->drupalPostForm(NULL, array(), t('Delete'));
+    $this->assertRaw(t('Are you sure you want to delete the block %name?', array('%name' => $block->label())));
+    $this->drupalPostForm(NULL, array(), t('Delete'));
+    $this->assertRaw(t('The block %name has been removed.', array('%name' => $block->label())));
+    $this->assertUrl('admin');
+    $this->assertNoRaw($block->id());
   }
 
   /**