Hide correct author info in header of issuable.

app/helpers/projects_helper.rb

@@ -38,12 +38,16 @@ module ProjectsHelper
     author_html << image_tag(avatar_icon(author, opts[:size]), width: opts[:size], class: "avatar avatar-inline #{"s#{opts[:size]}" if opts[:size]}", alt:'') if opts[:avatar]
 
     # Build name span tag
-    author_html << content_tag(:span, sanitize(author.name), class: opts[:author_class]) if opts[:name]
+    if opts[:by_username]
+      author_html << content_tag(:span, sanitize("@#{author.username}"), class: opts[:author_class]) if opts[:name]
+    else
+      author_html << content_tag(:span, sanitize(author.name), class: opts[:author_class]) if opts[:name]
+    end
 
     author_html = author_html.html_safe
 
     if opts[:name]
-      link_to(author_html, user_path(author), class: "author_link").html_safe
+      link_to(author_html, user_path(author), class: "author_link #{"#{opts[:mobile_classes]}" if opts[:mobile_classes]}").html_safe
     else
       title = opts[:title].sub(":name", sanitize(author.name))
       link_to(author_html, user_path(author), class: "author_link has_tooltip", data: { 'original-title'.to_sym => title, container: 'body' } ).html_safe

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

@@ -9,8 +9,10 @@
     Merge Request #{@merge_request.to_reference}
   %span.creator
     ·
-    by #{link_to_member(@project, @merge_request.author, size: 24)}
-    = '@' + @merge_request.author.username
+    by 
+    =link_to_member(@project, @merge_request.author, size: 24, mobile_classes: "hidden-xs")
+    =link_to_member(@project, @merge_request.author, size: 24,
+      by_username: true, avatar: false)
     ·
     = time_ago_with_tooltip(@merge_request.created_at)