title: How to set the PlaceHolderText for QTextEdit
body: <p>I want to set placeholder text of a <code>QTextEdit</code>. I know how to set it for a <code>QLineEdit</code>, <em>there is a property <code>setPlaceHolderText</code></em>. But this property is not available for <code>QTextEdit</code>. Please give your valuable suggestions to solve this.</p>