DevTools: Do not apply first suggestion in the classes pane on enter

third_party/WebKit/Source/devtools/front_end/elements/ClassesPaneWidget.js

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 /**
  * @unrestricted
  */
 Elements.ClassesPaneWidget = class extends UI.Widget {
   constructor() {
     super();
     this.element.className = 'styles-element-classes-pane';
@@ skipping 23 matching lines @@
     var text = event.target.textContent;
     if (isEscKey(event)) {
       event.target.textContent = '';
       if (!text.isWhitespace())
         event.consume(true);
       return;
     }
 
     if (!isEnterKey(event))
       return;
+    if (this._prompt.acceptAutoComplete()) {
+      event.consume(true);
+      return;
+    }
     var node = UI.context.flavor(SDK.DOMNode);
     if (!node)
       return;
 
     this._prompt.clearAutocomplete();
     event.target.textContent = '';
     var classNames = text.split(/[.,\s]/);
     for (var className of classNames) {
       var className = className.trim();
       if (!className.length)
@@ skipping 201 matching lines @@
     if (!this._classNamesPromise || this._selectedFrameId !== selectedNode.frameId())
       this._classNamesPromise = this._getClassNames(selectedNode);
 
     return this._classNamesPromise.then(completions => {
       if (prefix[0] === '.')
         completions = completions.map(value => '.' + value);
       return completions.filter(value => value.startsWith(prefix)).map(completion => ({text: completion}));
     });
   }
 };