Listen to the contentDom event to handle correctly setData calls

Pull request
noam-si@19fd0f8
but I don't know how to commit only this one instead of the whole pull
request

docs/install.html

@@ -37,7 +37,8 @@ <h3>Version history: </h3>
 	</li>
   <li>1.8.2: 12-April-2014. <a href="https://github.com/AlfonsoML/confighelper/pull/8">Protect detection of empty content</a>. Thanks to tanihito.
 	</li>
-  <li>1.8.3: Force SCAYT to use the language that it's specified as the language for the contents
+  <li>1.8.3: 30-November-2014. Force SCAYT to use the language that it's specified as the language for the contents.<br>
+			<a href="https://github.com/AlfonsoML/confighelper/pull/13">Listen to the contentDom event to avoid problems when calling setData in WYSIWYG mode</a>. Thanks to noam-si.
 	</li>
 </ol>
 

plugin.js

@@ -196,6 +196,7 @@ CKEDITOR.plugins.add( 'confighelper',
 
 			editor.on('blur', addPlaceholder, null, placeholder);
 			editor.on('mode', addPlaceholder, null, placeholder);
+			editor.on('contentDom', addPlaceholder, null, placeholder);
 
 			editor.on('focus', removePlaceholder);
 			editor.on('beforeModeUnload', removePlaceholder);