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
}
		}
		setReturnCode(CANCEL);
		close();
	}
	/**
	 * Clear the last selected node. This is so that we not chache
	 * the last selection in case of an error.
	 */
	void clearSelectedNode() {
		setSelectedNodePreference(null);
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.window.Window#close()
	 */
	public boolean close() {
		List nodes = preferenceManager.getElements(PreferenceManager.PRE_ORDER);
		for (int i = 0; i < nodes.size(); i++) {
			IPreferenceNode node = (IPreferenceNode) nodes.get(i);
			node.disposeResources();
		}
		return super.close();
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.window.Window#configureShell(org.eclipse.swt.widgets.Shell)
	 */
	protected void configureShell(Shell newShell) {
		super.configureShell(newShell);
		newShell.setText(JFaceResources.getString("PreferenceDialog.title")); 
		newShell.addShellListener(new ShellAdapter() {