Reused some variables

Set global JS variable to sync view up

app/assets/javascripts/issue.js.coffee

@@ -91,7 +91,7 @@ class @Issue
 
     # hide any participants from number 6
     $(".js-participants-author").each (i) ->
-      if i > 6
+      if i >= PARTICIPANTS_ROW
         $(@)
           .addClass "js-participants-hidden hidden"
 

app/views/shared/issuable/_participants.html.haml

+- participants_row = 7
 - participants_size = participants.size
-- participants_extra = participants_size - 7
+- participants_extra = participants_size - participants_row
+:javascript
+  var PARTICIPANTS_ROW = #{participants_row};
 .block.participants
   .sidebar-collapsed-icon
     = icon('users')
@@ -14,4 +17,4 @@
     - if participants_extra > 0
       %div.participants-more
         %a.js-participants-more{href: "#", data: {original_text: "+ #{participants_size - 7} more", less_text: "- show less"}}
-          + #{participants_size - 7} more
+          + #{participants_extra} more