DevTools: Avoid typing into ghost text in TextPrompt

third_party/WebKit/Source/devtools/front_end/ui/TextPrompt.js

 /*
  * Copyright (C) 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 27 matching lines @@
      */
     this._proxyElement;
     this._proxyElementDisplay = 'inline-block';
     this._autocompletionTimeout = UI.TextPrompt.DefaultAutocompletionTimeout;
     this._title = '';
     this._queryRange = null;
     this._previousText = '';
     this._currentSuggestion = '';
     this._completionRequestId = 0;
     this._ghostTextElement = createElementWithClass('span', 'auto-complete-text');
+    this._ghostTextElement.setAttribute('contenteditable', 'false');
   }
 
   /**
    * @param {(function(string, string, boolean=):!Promise<!UI.SuggestBox.Suggestions>)} completions
    * @param {string=} stopCharacters
    */
   initialize(completions, stopCharacters) {
     this._loadCompletions = completions;
     this._completionStopCharacters = stopCharacters || ' =:[({;,!+-*/&|^<>.';
   }
@@ skipping 571 matching lines @@
     return this._proxyElement || null;
   }
 };
 
 UI.TextPrompt.DefaultAutocompletionTimeout = 250;
 
 /** @enum {symbol} */
 UI.TextPrompt.Events = {
   TextChanged: Symbol('TextChanged')
 };