DevTools: fix adding excluded folder from settings screen

third_party/WebKit/Source/devtools/front_end/settings/EditFileSystemView.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 74 matching lines @@
 
   dispose() {
     Common.EventTarget.removeEventListeners(this._eventListeners);
   }
 
   _update() {
     if (this._muteUpdate)
       return;
 
     this._mappings = [];
+
+    this._excludedFoldersList.clear();
+    this._excludedFolders = [];
+    for (var folder of Workspace.isolatedFileSystemManager.fileSystem(this._fileSystemPath)
+             .excludedFolders()
+             .values()) {
+      this._excludedFolders.push(folder);
+      this._excludedFoldersList.appendItem(folder, true);
+    }
+
     if (Runtime.experiments.isEnabled('persistence2'))
       return;
 
     this._mappingsList.clear();
     var mappings = Workspace.fileSystemMapping.mappingEntries(this._fileSystemPath);
     for (var entry of mappings) {
       if (entry.configurable) {
         this._mappingsList.appendItem(entry, true);
         this._mappings.push(entry);
       }
     }
     for (var entry of mappings) {
       if (!entry.configurable) {
         this._mappingsList.appendItem(entry, false);
         this._mappings.push(entry);
       }
     }
 
-    this._excludedFoldersList.clear();
-    this._excludedFolders = [];
-    for (var folder of Workspace.isolatedFileSystemManager.fileSystem(this._fileSystemPath)
-             .excludedFolders()
-             .values()) {
-      this._excludedFolders.push(folder);
-      this._excludedFoldersList.appendItem(folder, true);
-    }
     for (var folder of Workspace.isolatedFileSystemManager.fileSystem(this._fileSystemPath)
              .nonConfigurableExcludedFolders()
              .values()) {
       this._excludedFolders.push(folder);
       this._excludedFoldersList.appendItem(folder, false);
     }
   }
 
   _addMappingButtonClicked() {
     var entry = new Workspace.FileSystemMapping.Entry(this._fileSystemPath, '', '', true);
@@ skipping 196 matching lines @@
   /**
    * @param {string} prefix
    * @return {string}
    */
   _normalizePrefix(prefix) {
     if (!prefix)
       return '';
     return prefix + (prefix[prefix.length - 1] === '/' ? '' : '/');
   }
 };