Bug 38009 [Wizards] Wizard banner text should wrap
Currently if wizard banner text is too long for the line, it's truncated. Hovering over it produces a pop-up with the complete text (unless I suppose it's too long to fit on the screen). In any case this looks really bad. If the text is too long for one line, it should be wrapped to multiple lines. A good UI designer isn't going to write wizard banner text that's enormously long, but the wizard framework should be able to handle it.
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/TitleAreaDialog.java
* An error message overrides the current message until the error message is 
 * cleared. This method replaces the current message and does not affect the 
 * error message.
 * </p>
 *
 * @param newMessage the message, or <code>null</code> to clear
 *   the message
 * @param newType the message type
 * @since 2.0
 */
public void setMessage(String newMessage, int newType) {
	Image newImage = null;
	
	if (newMessage != null) {
		switch (newType) {
			case IMessageProvider.NONE :
				break;
			case IMessageProvider.INFORMATION :
				newImage = JFaceResources.getImage(DLG_IMG_MESSAGE_INFO);
				break;
			case IMessageProvider.WARNING :
				newImage = JFaceResources.getImage(DLG_IMG_MESSAGE_WARNING);
				break;
			case IMessageProvider.ERROR :
				newImage = JFaceResources.getImage(DLG_IMG_MESSAGE_ERROR);
				break;
		}
	}
	
	showMessage(newMessage, newImage);