Add #closed_without_source_project?

app/models/merge_request.rb

@@ -313,7 +313,11 @@ class MergeRequest < ActiveRecord::Base
   end
 
   def closed_without_fork?
-    closed? && (forked_source_project_missing? || !source_project)
+    closed? && forked_source_project_missing?
+  end
+
+  def closed_without_source_project?
+    closed? && !source_project
   end
 
   def forked_source_project_missing?

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

@@ -2,7 +2,7 @@
   - if can?(current_user, :update_merge_request, @merge_request)
     - if @merge_request.open?
       = link_to 'Close merge request', merge_request_path(@merge_request, merge_request: {state_event: :close }), method: :put, class: "btn btn-nr btn-comment btn-close close-mr-link js-note-target-close", title: "Close merge request", data: {original_text: "Close merge request", alternative_text: "Comment & close merge request"}
-    - if @merge_request.closed?
+    - unless @merge_request.open? || @merge_request.closed_without_fork?
       = link_to 'Reopen merge request', merge_request_path(@merge_request, merge_request: {state_event: :reopen }), method: :put, class: "btn btn-nr btn-comment btn-reopen reopen-mr-link js-note-target-reopen", title: "Reopen merge request", data: {original_text: "Reopen merge request", alternative_text: "Comment & reopen merge request"}
   %comment-and-resolve-btn{ "inline-template" => true, ":discussion-id" => "" }
     %button.btn.btn-nr.btn-default.append-right-10.js-comment-resolve-button{ "v-if" => "showButton", type: "submit", data: { namespace_path: "#{@merge_request.project.namespace.path}", project_path: "#{@merge_request.project.path}" } }

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

@@ -29,6 +29,7 @@
             %ul.dropdown-menu.dropdown-menu-align-right
               %li= link_to "Email Patches", merge_request_path(@merge_request, format: :patch)
               %li= link_to "Plain Diff",    merge_request_path(@merge_request, format: :diff)
+      - unless @merge_request.closed_without_fork?
         .normal
           %span Request to merge
           %span.label-branch= source_branch_with_namespace(@merge_request)
@@ -38,6 +39,7 @@
           - if @merge_request.open? && @merge_request.diverged_from_target_branch?
             %span (#{pluralize(@merge_request.diverged_commits_count, 'commit')} behind)
 
+    - unless @merge_request.closed_without_source_project?
       = render "projects/merge_requests/show/how_to_merge"
       = render "projects/merge_requests/widget/show.html.haml"
 
@@ -53,6 +55,7 @@
           = link_to namespace_project_merge_request_path(@project.namespace, @project, @merge_request), data: { target: 'div#notes', action: 'notes', toggle: 'tab' } do
             Discussion
             %span.badge= @merge_request.mr_and_commit_notes.user.count
+        - unless @merge_request.closed_without_source_project?
           %li.commits-tab
             = link_to commits_namespace_project_merge_request_path(@project.namespace, @project, @merge_request), data: { target: 'div#commits', action: 'commits', toggle: 'tab' } do
               Commits