Merge branch '58297-remove-extraneous-gitaly-calls-from-md-rendering' into 'master'

Remove extraneous DiffNote#supports_suggestion? calls

See merge request gitlab-org/gitlab-ce!29027

app/models/diff_note.rb

@@ -90,7 +90,7 @@ class DiffNote < Note
   end
 
   def banzai_render_context(field)
-    super.merge(project: project, suggestions_filter_enabled: supports_suggestion?)
+    super.merge(suggestions_filter_enabled: true)
   end
 
   private

app/services/preview_markdown_service.rb

@@ -38,7 +38,9 @@ class PreviewMarkdownService < BaseService
                                           head_sha: params[:head_sha],
                                           start_sha: params[:start_sha])
 
-    Gitlab::Diff::SuggestionsParser.parse(text, position: position, project: project)
+    Gitlab::Diff::SuggestionsParser.parse(text, position: position,
+                                                project: project,
+                                                supports_suggestion: params[:preview_suggestions])
   end
 
   def preview_sugestions?

changelogs/unreleased/58297-remove-extraneous-gitaly-calls-from-md-rendering.yml

@@ -0,0 +1,5 @@
+---
+title: Reduce Gitaly calls to improve performance when rendering suggestions
+merge_request: 29027
+author:
+type: performance

lib/gitlab/diff/suggestions_parser.rb

@@ -10,10 +10,12 @@ module Gitlab
         # Returns an array of Gitlab::Diff::Suggestion which represents each
         # suggestion in the given text.
         #
-        def parse(text, position:, project:)
+        def parse(text, position:, project:, supports_suggestion: true)
           return [] unless position.complete?
 
-          html = Banzai.render(text, project: nil, no_original_data: true)
+          html = Banzai.render(text, project: nil,
+                                     no_original_data: true,
+                                     suggestions_filter_enabled: supports_suggestion)
           doc = Nokogiri::HTML(html)
           suggestion_nodes = doc.search('pre.suggestion')
 

spec/services/preview_markdown_service_spec.rb

@@ -56,7 +56,9 @@ describe PreviewMarkdownService do
 
         expect(Gitlab::Diff::SuggestionsParser)
           .to receive(:parse)
-          .with(text, position: position, project: merge_request.project)
+          .with(text, position: position,
+                      project: merge_request.project,
+                      supports_suggestion: true)
           .and_call_original
 
         result = service.execute

spec/services/suggestions/create_service_spec.rb

@@ -96,7 +96,7 @@ describe Suggestions::CreateService do
 
       it 'creates no suggestion when diff file is not found' do
         expect_next_instance_of(DiffNote) do |diff_note|
-          expect(diff_note).to receive(:latest_diff_file).twice { nil }
+          expect(diff_note).to receive(:latest_diff_file).once { nil }
         end
 
         expect { subject.execute }.not_to change(Suggestion, :count)