Use the same partial when rendering Issues or Merge Requests.

app/assets/stylesheets/pages/milestone.scss

@@ -19,7 +19,7 @@ li.milestone {
     width: 105px;
   }
-  .issue-row, .mr-row {
+  .issue-row, .merge_request-row {
     .color-label {
       border-radius: 2px;
       padding: 3px !important;
@@ -45,10 +45,10 @@ li.milestone {
 }
 .issues-sortable-list, .merge_requests-sortable-list {
-  .issue-detail, .merge-request-detail {
+  .issue-detail, .merge_request-detail {
     display: block;
-    .issue-number, .merge-request-number {
+    .issue-number, .merge_request-number {
       color: rgba(0,0,0,0.44);
       margin-right: 5px;
     }

app/views/shared/milestones/_issue.html.haml

--# @project is present when viewing Project's milestone
-- project = @project || issue.project
-
-%li{ id: dom_id(issue, 'sortable'), class: 'issue-row', 'data-iid' => issue.iid, 'data-url' => issue_path(issue) }
-  %span
-    - if show_project_name
-      %strong #{project.name} ·
-    - elsif show_full_project_name
-      %strong #{project.name_with_namespace} ·
-    = link_to_gfm issue.title, [project.namespace.becomes(Namespace), project, issue], title: issue.title
-  .issue-detail
-    = link_to [project.namespace.becomes(Namespace), project, issue] do
-      %span.issue-number ##{issue.iid}
-    - issue.labels.each do |label|
-      = render_colored_label(label)
-    - if issue.assignee
-      = image_tag avatar_icon(issue.assignee, 16), class: "avatar s24", alt: ''

app/views/shared/milestones/_issues.html.haml

-.panel.panel-default
-  .panel-heading
-    = title
-    .pull-right= issues.size
-  %ul{ class: "well-list issues-sortable-list", id: "issues-list-#{id}", "data-state" => id }
-    - issues.sort_by(&:position).each do |issue|
-      = render 'shared/milestones/issue', issue: issue, show_project_name: show_project_name, show_full_project_name: show_full_project_name

app/views/shared/milestones/_issues_tab.html.haml

@@ -3,8 +3,8 @@
 .row.prepend-top-default
   .col-md-4
-    = render 'shared/milestones/issues', args.merge({ title: 'Unstarted Issues (open and unassigned)', issues: unassigned, id: 'unassigned' })
+    = render 'shared/milestones/records', args.merge({ title: 'Unstarted Issues (open and unassigned)', records: unassigned, id: 'unassigned', show_counter: true })
   .col-md-4
-    = render 'shared/milestones/issues', args.merge({ title: 'Ongoing Issues (open and assigned)', issues: assigned, id: 'ongoing' })
+    = render 'shared/milestones/records', args.merge({ title: 'Ongoing Issues (open and assigned)', records: assigned, id: 'ongoing', show_counter: true })
   .col-md-4
-    = render 'shared/milestones/issues', args.merge({ title: 'Completed Issues (closed)', issues: closed, id: 'closed' })
+    = render 'shared/milestones/records', args.merge({ title: 'Completed Issues (closed)', records: closed, id: 'closed', show_counter: true })

app/views/shared/milestones/_merge_request.html.haml

--# @project is present when viewing Project's milestone
-- project = @project || merge_request.project
-
-%li{ id: dom_id(merge_request, 'sortable'),  class: 'mr-row', 'data-iid' => merge_request.iid, 'data-url' => merge_request_path(merge_request) }
-  %span
-    - if show_project_name
-      %strong #{project.name} ·
-    - elsif show_full_project_name
-      %strong #{project.name_with_namespace} ·
-    = link_to_gfm merge_request.title, [project.namespace.becomes(Namespace), project, merge_request], title: merge_request.title
-  .merge-request-detail
-    = link_to [project.namespace.becomes(Namespace), project, merge_request] do
-      %span.merge-request-number ##{merge_request.iid}
-    - merge_request.labels.each do |label|
-      = render_colored_label(label)
-    - if merge_request.assignee
-      = image_tag avatar_icon(merge_request.assignee, 16), class: "avatar s16", alt: ''

app/views/shared/milestones/_merge_requests.html.haml

-- primary = local_assigns.fetch(:primary, false)
-- panel_class = primary ? 'panel-primary' : 'panel-default'
-
-.panel{ class: panel_class }
-  .panel-heading= title
-  %ul{ class: "well-list merge_requests-sortable-list", id: "merge_requests-list-#{id}", "data-state" => id }
-    - merge_requests.sort_by(&:position).each do |merge_request|
-      = render 'shared/milestones/merge_request', merge_request: merge_request, show_project_name: show_project_name, show_full_project_name: show_full_project_name

app/views/shared/milestones/_merge_requests_tab.haml

@@ -3,10 +3,10 @@
 .row.prepend-top-default
   .col-md-3
-    = render 'shared/milestones/merge_requests', args.merge({ title: 'Work in progress (open and unassigned)', merge_requests: unassigned, id: 'unassigned' })
+    = render 'shared/milestones/records', args.merge({ title: 'Work in progress (open and unassigned)', records: unassigned, id: 'unassigned' })
   .col-md-3
-    = render 'shared/milestones/merge_requests', args.merge({ title: 'Waiting for merge (open and assigned)', merge_requests: assigned, id: 'ongoing' })
+    = render 'shared/milestones/records', args.merge({ title: 'Waiting for merge (open and assigned)', records: assigned, id: 'ongoing' })
   .col-md-3
-    = render 'shared/milestones/merge_requests', args.merge({ title: 'Rejected (closed)', merge_requests: closed, id: 'closed' })
+    = render 'shared/milestones/records', args.merge({ title: 'Rejected (closed)', records: closed, id: 'closed' })
   .col-md-3
-    = render 'shared/milestones/merge_requests', args.merge({ title: 'Merged', merge_requests: merged, id: 'merged', primary: true })
+    = render 'shared/milestones/records', args.merge({ title: 'Merged', records: merged, id: 'merged', primary: true })