only include _html fields when asked for

app/assets/javascripts/api.js

@@ -100,12 +100,12 @@ const Api = {
   },
 
   // Return Merge Request for project
-  mergeRequest(projectPath, mergeRequestId) {
+  mergeRequest(projectPath, mergeRequestId, params = {}) {
     const url = Api.buildUrl(Api.mergeRequestPath)
       .replace(':id', encodeURIComponent(projectPath))
       .replace(':mrid', mergeRequestId);
 
-    return axios.get(url);
+    return axios.get(url, { params });
   },
 
   mergeRequests(params = {}) {

app/assets/javascripts/ide/services/index.js

@@ -40,8 +40,8 @@ export default {
   getProjectData(namespace, project) {
     return Api.project(`${namespace}/${project}`);
   },
-  getProjectMergeRequestData(projectId, mergeRequestId) {
-    return Api.mergeRequest(projectId, mergeRequestId);
+  getProjectMergeRequestData(projectId, mergeRequestId, params = {}) {
+    return Api.mergeRequest(projectId, mergeRequestId, params);
   },
   getProjectMergeRequestChanges(projectId, mergeRequestId) {
     return Api.mergeRequestChanges(projectId, mergeRequestId);

app/assets/javascripts/ide/stores/actions/merge_request.js

@@ -9,7 +9,7 @@ export const getMergeRequestData = (
   new Promise((resolve, reject) => {
     if (!state.projects[projectId].mergeRequests[mergeRequestId] || force) {
       service
-        .getProjectMergeRequestData(projectId, mergeRequestId)
+        .getProjectMergeRequestData(projectId, mergeRequestId, { render_html: true })
         .then(({ data }) => {
           commit(types.SET_MERGE_REQUEST, {
             projectPath: projectId,

lib/api/entities.rb

@@ -388,12 +388,6 @@ module API
       expose :id, :iid
       expose(:project_id) { |entity| entity&.project.try(:id) }
       expose :title, :description
-      expose :title_html do |entity|
-        MarkupHelper::markdown_field(entity, :title)
-      end
-      expose :description_html do |entity|
-        MarkupHelper::markdown_field(entity, :description)
-      end
       expose :state, :created_at, :updated_at
     end
 
@@ -538,6 +532,12 @@ module API
     end
 
     class MergeRequestBasic < ProjectEntity
+      expose :title_html, if: -> (_, options) { options[:render_html] } do |entity|
+        MarkupHelper::markdown_field(entity, :title)
+      end
+      expose :description_html, if: -> (_, options) { options[:render_html] } do |entity|
+        MarkupHelper::markdown_field(entity, :description)
+      end
       expose :target_branch, :source_branch
       expose :upvotes do |merge_request, options|
         if options[:issuable_metadata]

lib/api/merge_requests.rb

@@ -232,6 +232,7 @@ module API
 
       params do
         requires :merge_request_iid, type: Integer, desc: 'The IID of a merge request'
+        optional :render_html, type: Boolean, desc: 'Returns the description and title rendered html'
       end
       desc 'Get a single merge request' do
         success Entities::MergeRequest
@@ -239,7 +240,7 @@ module API
       get ':id/merge_requests/:merge_request_iid' do
         merge_request = find_merge_request_with_access(params[:merge_request_iid])
 
-        present merge_request, with: Entities::MergeRequest, current_user: current_user, project: user_project
+        present merge_request, with: Entities::MergeRequest, current_user: current_user, project: user_project, render_html: params[:render_html]
       end
 
       desc 'Get the participants of a merge request' do