Improve issue sidebar position

app/assets/javascripts/issue.js.coffee

@@ -19,6 +19,6 @@ class @Issue
     $('.issue-details').waitForImages ->
       $('.issuable-affix').affix offset:
         top: ->
-          @top = $('.issue-details').outerHeight(true) + 25
+          @top = ($('.issuable-affix').offset().top - 70)
         bottom: ->
           @bottom = $('.footer').outerHeight(true)

app/assets/javascripts/merge_request.js.coffee

@@ -23,7 +23,7 @@ class @MergeRequest
     $('.merge-request-details').waitForImages ->
       $('.issuable-affix').affix offset:
         top: ->
-          @top = $('.merge-request-details').outerHeight(true) + 91
+          @top = ($('.issuable-affix').offset().top - 70)
         bottom: ->
           @bottom = $('.footer').outerHeight(true)