Display link to review note in text email

similar with HTML email

app/views/notify/_note_email.text.erb

 <% note = local_assigns.fetch(:note, @note) -%>
 <% diff_limit = local_assigns.fetch(:diff_limit, nil) -%>
+<% target_url = local_assigns.fetch(:target_url, @target_url) -%>
 
 <%  discussion = note.discussion if note.part_of_discussion? -%>
 <%  if discussion && !discussion.individual_note? -%>
@@ -13,6 +14,9 @@
 <%=     " on #{discussion.file_path}" -%>
 <%    end -%>
 <%=   ":" -%>
+<%    if discussion.diff_discussion? || !discussion.new_discussion? -%>
+<%=     " #{target_url}" -%>
+<%    end -%>
 
 
 <%  elsif Gitlab::CurrentSettings.email_author_in_body -%>

ee/app/views/notify/new_review_email.text.erb

@@ -2,7 +2,8 @@
 
 --
 <% @notes.each_with_index do |note, index| %>
-  <%= render 'note_email', note: note, diff_limit: 3 %>
+  <% target_url = project_merge_request_url(@project, @merge_request, anchor: "note_#{note.id}") %>
+  <%= render 'note_email', note: note, diff_limit: 3, target_url: target_url %>
 
   <% if index != @notes.length-1 %>
 --

ee/changelogs/unreleased/10220-link-to-note-from-email.yml

+---
+title: Display link to review note in text email, similar to HTML email
+merge_request: 10401
+author:
+type: changed

ee/spec/mailers/notify_spec.rb

@@ -278,8 +278,8 @@ describe Notify do
   end
 
   describe 'merge request reviews' do
-    let(:review) { create(:review, project: project, merge_request: merge_request) }
-    let(:notes) { create_list(:notes, 3, review: review, project: project, author: review.author, noteable: merge_request) }
+    let!(:review) { create(:review, project: project, merge_request: merge_request) }
+    let!(:notes) { create_list(:note, 3, review: review, project: project, author: review.author, noteable: merge_request) }
 
     subject { described_class.new_review_email(recipient.id, review.id) }
 
@@ -305,6 +305,19 @@ describe Notify do
       end
     end
 
+    context 'when diff note' do
+      let!(:notes) { create_list(:diff_note_on_merge_request, 3, review: review, project: project, author: review.author, noteable: merge_request) }
+
+      it 'links to notes' do
+        review.notes.each do |note|
+          # Text part
+          expect(subject.text_part.body.raw_source).to include(
+            project_merge_request_url(project, merge_request, anchor: "note_#{note.id}")
+          )
+        end
+      end
+    end
+
     it 'contains review author name' do
       is_expected.to have_body_text review.author_name
     end