Added workaround for github-markup issue with rendering markdown

app/helpers/tree_helper.rb

@@ -32,7 +32,11 @@ module TreeHelper
   #
   # Returns boolean
   def markup?(filename)
-    filename.end_with?(*%w(.mdown .md .markdown .textile .rdoc .org .creole
+    filename.end_with?(*%w(.textile .rdoc .org .creole
                            .mediawiki .rst .asciidoc .pod))
   end
+
+  def gitlab_markdown?(filename)
+    filename.end_with?(*%w(.mdown .md .markdown))
+  end
 end

app/views/refs/_tree.html.haml

@@ -43,6 +43,10 @@
           %i.icon-file
           = content.name
         .file_content.wiki
+          - if gitlab_markdown?(content.name)
+            = preserve do
+              = markdown(content.data)
+          - else
             = raw GitHub::Markup.render(content.name, content.data)
 
 :javascript

app/views/refs/_tree_file.html.haml

@@ -9,7 +9,11 @@
       = link_to "history", project_commits_path(@project, path: params[:path], ref: @ref), class: "btn very_small"
       = link_to "blame", blame_file_project_ref_path(@project, @ref, path: params[:path]), class: "btn very_small"
   - if file.text?
-    - if markup?(name)
+    - if gitlab_markdown?(name)
+      .file_content.wiki
+        = preserve do
+          = markdown(file.data)
+    - elsif markup?(name)
       .file_content.wiki
         = raw GitHub::Markup.render(name, file.data)
     - else