title: Control size of text-only buttons in QToolBar
body: <p>I'm using PySide. I have a QMainWindow with a vertical QToolBar <code>myToolBar</code>. I use <code>myToolBar.toolButtonStyle = Qt.ToolButtonTextOnly</code> to make the toolbar's buttons contain only text, no icons. I add QActions to the QToolBar, and buttons are automatically created. I'd like to make the buttons taller, but since I'm not using any QToolButton objects, I don't know how. QAction has a setFont() method, so I can make the font larger, but what I want is some padding inside the button. How can I accomplish that?</p>