Remove feature flag for suggest changes feature

app/models/merge_request.rb

@@ -364,8 +364,7 @@ class MergeRequest < ActiveRecord::Base
   end
 
   def supports_suggestion?
-    # Should be `true` when removing the FF.
-    Suggestion.feature_enabled?
+    true
   end
 
   # Calls `MergeWorker` to proceed with the merge process and

app/models/suggestion.rb

 # frozen_string_literal: true
 
 class Suggestion < ApplicationRecord
-  FEATURE_FLAG = :diff_suggestions
-
   belongs_to :note, inverse_of: :suggestions
   validates :note, presence: true
   validates :commit_id, presence: true, if: :applied?
@@ -10,10 +8,6 @@ class Suggestion < ApplicationRecord
   delegate :original_position, :position, :diff_file,
     :noteable, to: :note
 
-  def self.feature_enabled?
-    Feature.enabled?(FEATURE_FLAG)
-  end
-
   def project
     noteable.source_project
   end

app/views/projects/merge_requests/show.html.haml

@@ -5,6 +5,7 @@
 - page_title "#{@merge_request.title} (#{@merge_request.to_reference})", "Merge Requests"
 - page_description @merge_request.description
 - page_card_attributes @merge_request.card_attributes
+- suggest_changes_help_path = help_page_path('user/discussions/index.md', anchor: 'suggest-changes')
 
 .merge-request{ data: { mr_action: j(params[:tab].presence || 'show'), url: merge_request_path(@merge_request, format: :json), project_path: project_path(@merge_request.project) } }
   = render "projects/merge_requests/mr_title"
@@ -67,7 +68,7 @@
                 noteable_data: serialize_issuable(@merge_request),
                 noteable_type: 'MergeRequest',
                 target_type: 'merge_request',
-                help_page_path: nil,
+                help_page_path: suggest_changes_help_path,
                 current_user_data: UserSerializer.new(project: @project).represent(current_user, {}, MergeRequestUserEntity).to_json} }
 
       #commits.commits.tab-pane
@@ -77,7 +78,7 @@
           = render 'projects/commit/pipelines_list', disable_initialization: true, endpoint: pipelines_project_merge_request_path(@project, @merge_request)
       #js-diffs-app.diffs.tab-pane{ data: { "is-locked" => @merge_request.discussion_locked?,
         endpoint: diffs_project_merge_request_path(@project, @merge_request, 'json', request.query_parameters),
-        help_page_path: nil,
+        help_page_path: suggest_changes_help_path,
         current_user_data: UserSerializer.new(project: @project).represent(current_user, {}, MergeRequestUserEntity).to_json,
         project_path: project_path(@merge_request.project),
         changes_empty_state_illustration: image_path('illustrations/merge_request_changes_empty.svg') } }

lib/banzai/filter/suggestion_filter.rb

@@ -7,7 +7,6 @@ module Banzai
       TAG_CLASS = 'js-render-suggestion'.freeze
 
       def call
-        return doc unless Suggestion.feature_enabled?
         return doc unless suggestions_filter_enabled?
 
         doc.search('pre.suggestion > code').each do |node|

spec/lib/banzai/filter/suggestion_filter_spec.rb

@@ -17,15 +17,6 @@ describe Banzai::Filter::SuggestionFilter do
     expect(result[:class]).to include('js-render-suggestion')
   end
 
-  it 'includes no `js-render-suggestion` when feature disabled' do
-    stub_feature_flags(diff_suggestions: false)
-
-    doc = filter(input, default_context)
-    result = doc.css('code').first
-
-    expect(result[:class]).to be_nil
-  end
-
   it 'includes no `js-render-suggestion` when filter is disabled' do
     doc = filter(input)
     result = doc.css('code').first