reverted:
--- b/core/modules/system/lib/Drupal/system/Tests/Menu/BreadcrumbTest.php
+++ a/core/modules/system/lib/Drupal/system/Tests/Menu/BreadcrumbTest.php
@@ -17,7 +17,7 @@
    *
    * @var array
    */
+  public static $modules = array('menu_test');
-  public static $modules = array('menu_test', 'views');
 
   protected $profile = 'standard';
 
@@ -309,7 +309,7 @@
     $this->drupalPost("node/{$parent->nid}/edit", $edit, t('Save'));
 
     // Put both terms into a hierarchy Drupal » Breadcrumbs. Required for both
+    // the menu links and the terms itself, since taxonomy_term_page() resets
-    // the menu links and the terms itself, since the taxonomy term page resets
     // the breadcrumb based on taxonomy term hierarchy.
     $parent_tid = 0;
     foreach ($tags as $name => $null) {
@@ -365,7 +365,7 @@
       $this->assertTrue(count($elements) == 1, "Link to {$link['link_path']} appears only once.");
 
       // Next iteration should expect this tag as parent link.
+      // Note: Term name, not link name, due to taxonomy_term_page().
-      // Note: Term name, not link name, due to the taxonomy term page.
       $trail += array(
         $link['link_path'] => $term->name,
       );
diff -u b/core/modules/taxonomy/taxonomy.views.inc b/core/modules/taxonomy/taxonomy.views.inc
--- b/core/modules/taxonomy/taxonomy.views.inc
+++ b/core/modules/taxonomy/taxonomy.views.inc
@@ -479,18 +479,18 @@
  * Helper function to set a breadcrumb for taxonomy.
+ *
+ * @param array &$breadcrumb
+ *   An array reference containing a reference to $view->build_info['breadcrumb'].
+ * @param \Drupal\views\Plugin\views\argument\ArgumentPluginBase $argument
+ *   The argument handler instance to get the argument from.
+ *
  */
 function views_taxonomy_set_breadcrumb(&$breadcrumb, &$argument) {
-  if (empty($argument->options['set_breadcrumb'])) {
-    return;
-  }
-
-  $args = $argument->view->args;
-  $parents = taxonomy_term_load_parents($argument->argument);
-
-  foreach (array_reverse($parents) as $parent) {
-    $parent = array_shift($parents);
-
-    $path = $parent->uri();
-    $path = $path['path'];
-    $breadcrumb[$path] = check_plain($parent->label());
+  $breadcrumb = array();
+  $current = taxonomy_term_load($argument->argument);
+  while ($parents = taxonomy_term_load_parents($current->id())) {
+    $current = array_shift($parents);
+    $uri = $current->uri();
+    $breadcrumb[$uri['path']] = $current->label();
   }
+  $breadcrumb = array_reverse($breadcrumb);
 }
only in patch2:
unchanged:
--- a/core/modules/views/lib/Drupal/views/ViewExecutable.php
+++ b/core/modules/views/lib/Drupal/views/ViewExecutable.php
@@ -1752,7 +1752,9 @@ public function getBreadcrumb($set = FALSE) {
 
       if ($set) {
         if ($base) {
-          $breadcrumb = array_merge(drupal_get_breadcrumb(), $breadcrumb);
+          // Just add the frontpage (so the first item of the breadcrumbs).
+          $existing_breadcrumb = drupal_get_breadcrumb();
+          $breadcrumb = array_merge(array($existing_breadcrumb[0]), $breadcrumb);
         }
         drupal_set_breadcrumb($breadcrumb);
       }