Bug 56637 [Preferences] DialogMessageArea image is too large
Is the background color of the error shown by DialogMessageArea to be changed? Or do you intend to leave it as it is right now? The error message looks a little out of place in the current implementation (being surrounded by white space).
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
}
	/**
	 * Get the name of the selected item preference
	 */
	protected String getSelectedNodePreference() {
		return lastPreferenceId;
	}
	/** 
	 * @param selection the <code>ISelection</code> to examine.
	 * @return the first element, or null if empty.
	 */
	protected IPreferenceNode getSingleSelection(ISelection selection) {
		if (!selection.isEmpty())
			return (IPreferenceNode) ((IStructuredSelection) selection).getFirstElement();
		return null;
	}
	/** 
	 * @return the <code>TreeViewer</code> for this dialog.
	 * @since 3.0
	 */
	protected TreeViewer getTreeViewer() {
		return treeViewer;
	}
	/**
	 * Save the values specified in the pages.
	 * <p>
	 * The default implementation of this framework method saves all
	 * pages of type <code>PreferencePage</code> (if their store needs saving
	 * and is a <code>PreferenceStore</code>).
	 * </p>