Issue #3277552 by Hebl, Asha Nair, rootwork, Charles Belov: Seven is missing focus in "Available buttons" and "Active toolbar" within CKEditor toolbar configuration Primary tab

core/themes/seven/css/theme/ckeditor-admin.css

@@ -0,0 +1,15 @@
+/**
+ * @file
+ * Seven specific styling for CKEditor admin.
+ */
+
+/*
+ * This rule is needed to provide Seven's blue focus outline.
+ */
+.ckeditor-toolbar-disabled .ckeditor-buttons li a:focus {
+  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05), 0 0 8px #40b6ff;
+}
+
+.ckeditor-toolbar-active .ckeditor-buttons li a:focus {
+  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05), 0 0 8px #40b6ff;
+}

core/themes/seven/seven.info.yml

@@ -52,6 +52,7 @@ libraries-override:
 libraries-extend:
   core/ckeditor:
     - seven/ckeditor-dialog
+    - seven/ckeditor-admin
   core/drupal.autocomplete:
     - seven/seven.jquery.ui
   core/drupal.dialog:

core/themes/seven/seven.libraries.yml

@@ -137,6 +137,12 @@ seven.drupal.dialog:
     theme:
       css/components/dialog.css: {}
 
+ckeditor-admin:
+  version: VERSION
+  css:
+    theme:
+      css/theme/ckeditor-admin.css: {}
+
 ckeditor-dialog:
   version: VERSION
   css: