Fixed Left side comments

app/assets/javascripts/commons/vue.js

 import Vue from 'vue';
 import '../vue_shared/vue_resource_interceptor';
 
-Vue.config.performance = true;
-
 if (process.env.NODE_ENV !== 'production') {
   Vue.config.productionTip = false;
 }

app/assets/javascripts/diffs/store/actions.js

@@ -42,8 +42,12 @@ export const assignDiscussionsToDiff = ({ state }, allLineDiscussions) => {
         );
 
         if (targetLine) {
+          if (targetLine.left && targetLine.left.lineCode === discussions[0].line_code) {
+            Object.assign(targetLine.left, { discussions });
+          } else {
             Object.assign(targetLine.right, { discussions });
           }
+        }
 
         const targetInlineLine = selectedFile.highlightedDiffLines.find(
           line => line.lineCode === discussions[0].line_code,