Fixes diff suggestions not working when replying to comments

https://gitlab.com/gitlab-org/gitlab/-/issues/293891

app/assets/javascripts/vue_shared/components/markdown/field.vue

@@ -110,11 +110,6 @@ export default {
       return this.referencedUsers.length >= referencedUsersThreshold;
     },
     lineContent() {
-      const [firstSuggestion] = this.suggestions;
-      if (firstSuggestion) {
-        return firstSuggestion.from_content;
-      }
-
       if (this.line) {
         const { rich_text: richText, text } = this.line;
 

changelogs/unreleased/ph-293891-fixSuggestionsToReplies.yml

+---
+title: Fixed sdiff suggestions not working when replying to comments
+merge_request: 52100
+author:
+type: fixed

spec/features/merge_request/user_suggests_changes_on_diff_spec.rb

@@ -73,6 +73,23 @@ RSpec.describe 'User comments on a diff', :js do
       end
     end
 
+    it 'allows suggestions in replies' do
+      click_diff_line(find("[id='#{sample_compare.changes[1][:line_code]}']"))
+
+      page.within('.js-discussion-note-form') do
+        fill_in('note_note', with: "```suggestion\n# change to a comment\n```")
+        click_button('Add comment now')
+      end
+
+      wait_for_requests
+
+      click_button 'Reply...'
+
+      find('.js-suggestion-btn').click
+
+      expect(find('.js-vue-issue-note-form').value).to include("url = https://github.com/gitlabhq/gitlab-shell.git")
+    end
+
     it 'suggestion is appliable' do
       click_diff_line(find("[id='#{sample_compare.changes[1][:line_code]}']"))