Fix reply quote keyboard shortcut on MRs

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/40295

app/assets/javascripts/dispatcher.js

@@ -317,7 +317,6 @@ import Diff from './diff';
           break;
         case 'projects:merge_requests:show':
           new Diff();
-          shortcut_handler = new ShortcutsIssuable(true);
           new ZenMode();
           initIssuableSidebar();
@@ -327,6 +326,8 @@ import Diff from './diff';
           window.mergeRequest = new MergeRequest({
             action: mrShowNode.dataset.mrAction,
           });
+
+          shortcut_handler = new ShortcutsIssuable(true);
           break;
         case 'dashboard:activity':
           new gl.Activities();

spec/features/issuables/shortcuts_issuable_spec.rb

+require 'spec_helper'
+
+feature 'Blob shortcuts', :js do
+  let(:user) { create(:user) }
+  let(:project) { create(:project, :public, :repository) }
+  let(:issue) { create(:issue, project: project, author: user) }
+  let(:merge_request) { create(:merge_request, source_project: project) }
+  let(:note_text) { 'I got this!' }
+
+  before do
+    project.add_developer(user)
+    sign_in(user)
+  end
+
+  describe 'pressing "r"' do
+    describe 'On an Issue' do
+      before do
+        create(:note, noteable: issue, project: project, note: note_text)
+        visit project_issue_path(project, issue)
+        wait_for_requests
+      end
+
+      it 'quotes the selected text' do
+        select_element('.note-text')
+        find('body').native.send_key('r')
+
+        expect(find('.js-main-target-form .js-vue-comment-form').value).to include(note_text)
+      end
+    end
+
+    describe 'On a Merge Request' do
+      before do
+        create(:note, noteable: merge_request, project: project, note: note_text)
+        visit project_merge_request_path(project, merge_request)
+        wait_for_requests
+      end
+
+      it 'quotes the selected text' do
+        select_element('.note-text')
+        find('body').native.send_key('r')
+
+        expect(find('.js-main-target-form #note_note').value).to include(note_text)
+      end
+    end
+  end
+end

spec/spec_helper.rb

@@ -50,6 +50,7 @@ RSpec.configure do |config|
   config.include SearchHelpers, type: :feature
   config.include CookieHelper, :js
   config.include InputHelper, :js
+  config.include SelectionHelper, :js
   config.include InspectRequests, :js
   config.include WaitForRequests, :js
   config.include LiveDebugger, :js

spec/support/selection_helper.rb

+module SelectionHelper
+  def select_element(selector)
+    find(selector)
+    execute_script("let range = document.createRange(); let sel = window.getSelection(); range.selectNodeContents(document.querySelector('#{selector}')); sel.addRange(range);")
+  end
+end