Issue #2879663 by icurk, jzavrl: Contextual link for removing block

modules/context_ui/context_ui.links.contextual.yml

 context_block_config:
   title: 'Configure block'
   route_name: 'context.reaction.blocks.block_edit'
-  group: 'context_block'
\ No newline at end of file
+  group: 'context_block'
+context_block_delete:
+  title: 'Remove block from context'
+  route_name: 'context.reaction.blocks.block_delete'
+  group: 'context_block'

src/Reaction/Blocks/Form/BlockDeleteForm.php

@@ -103,13 +103,12 @@ class BlockDeleteForm extends ConfirmFormBase {
     // button very well.
     if ($this->getRequest()->isXmlHttpRequest()) {
       unset($form['actions']['cancel']);
+      // Submit the form with AJAX if possible.
+      $form['actions']['submit']['#ajax'] = [
+        'callback' => '::submitFormAjax'
+      ];
     }
 
-    // Submit the form with AJAX if possible.
-    $form['actions']['submit']['#ajax'] = [
-      'callback' => '::submitFormAjax'
-    ];
-
     return $form;
   }