Fix affix for issue and merge request with image in description

app/assets/javascripts/issue.js.coffee

@@ -16,8 +16,9 @@ class @Issue
       updateTaskState
     )
 
-    $('.issuable-affix').affix offset:
-      top: ->
-        @top = $('.issue-details').outerHeight(true) + 25
-      bottom: ->
-        @bottom = $('.footer').outerHeight(true)
+    $('.issue-details').waitForImages ->
+      $('.issuable-affix').affix offset:
+        top: ->
+          @top = $('.issue-details').outerHeight(true) + 25
+        bottom: ->
+          @bottom = $('.footer').outerHeight(true)

app/assets/javascripts/merge_request.js.coffee

@@ -20,11 +20,12 @@ class @MergeRequest
     if $("a.btn-close").length
       $("li.task-list-item input:checkbox").prop("disabled", false)
 
-    $('.issuable-affix').affix offset:
-      top: ->
-        @top = $('.merge-request-details').outerHeight(true) + 70
-      bottom: ->
-        @bottom = $('.footer').outerHeight(true)
+    $('.merge-request-details').waitForImages ->
+      $('.issuable-affix').affix offset:
+        top: ->
+          @top = $('.merge-request-details').outerHeight(true) + 91
+        bottom: ->
+          @bottom = $('.footer').outerHeight(true)
 
   # Local jQuery finder
   $: (selector) ->