Fix affix for issue and merge request with image in description

app/assets/javascripts/issue.js.coffee

@@ -16,6 +16,7 @@ class @Issue
       updateTaskState
     )
 
+    $('.issue-details').waitForImages ->
       $('.issuable-affix').affix offset:
         top: ->
           @top = $('.issue-details').outerHeight(true) + 25

app/assets/javascripts/merge_request.js.coffee

@@ -20,9 +20,10 @@ class @MergeRequest
     if $("a.btn-close").length
       $("li.task-list-item input:checkbox").prop("disabled", false)
 
+    $('.merge-request-details').waitForImages ->
       $('.issuable-affix').affix offset:
         top: ->
-        @top = $('.merge-request-details').outerHeight(true) + 70
+          @top = $('.merge-request-details').outerHeight(true) + 91
         bottom: ->
           @bottom = $('.footer').outerHeight(true)