Bug 63159 [Progress] Progress dialog "Run in Background" button does not resize with larger font
If you set the dialog font to something large, the "Run in background" button does not correctly resize.
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/Dialog.java
* This method must be called before any of the dialog unit based conversion
	 * methods are called.
	 * </p>
	 * 
	 * @param control
	 *            a control from which to obtain the current font
	 */
	protected void initializeDialogUnits(Control control) {
		
		GC gc = new GC(control);
		gc.setFont(JFaceResources.getDialogFont());
		fontMetrics = gc.getFontMetrics();
		gc.dispose();
	}
	/**
	 * Notifies that the ok button of this dialog has been pressed.
	 * <p>
	 * The <code>Dialog</code> implementation of this framework method sets
	 * this dialog's return code to <code>Window.OK</code> and closes the
	 * dialog. Subclasses may override.
	 * </p>
	 */
	protected void okPressed() {
		setReturnCode(OK);
		close();
	}
	/**
	 * Set the layout data of the button to a GridData with appropriate heights
	 * and widths.
	 *