remove newIssue function logic from list model

app/assets/javascripts/boards/models/list.js

@@ -114,13 +114,7 @@ class List {
   }
 
   newIssue(issue) {
-    this.addIssue(issue, null, 0);
-    this.issuesSize += 1;
-
-    return boardsStore
-      .newIssue(this.id, issue)
-      .then(res => res.data)
-      .then(data => this.onNewIssueResponse(issue, data));
+    return boardsStore.newListIssue(issue);
   }
 
   createIssues(data) {

app/assets/javascripts/boards/stores/boards_store.js

@@ -607,6 +607,15 @@ const boardsStore = {
     });
   },
 
+  newListIssue(issue) {
+    list.addIssue(issue, null, 0);
+    list.issuesSize += 1;
+
+    return this.newIssue(list.id, issue)
+      .then(res => res.data)
+      .then(data => list.onNewIssueResponse(issue, data));
+  },
+
   getBacklog(data) {
     return axios.get(
       mergeUrlParams(