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
protected IPreferenceNode findNodeMatching(String nodeId) {
		List nodes = preferenceManager.getElements(PreferenceManager.POST_ORDER);
		for (Iterator i = nodes.iterator(); i.hasNext();) {
			IPreferenceNode node = (IPreferenceNode) i.next();
			if (node.getId().equals(nodeId))
				return node;
		}
		return null;
	}
	/**
	 * Get the last known tree width.
	 * 
	 * @return the width.
	 */
	private int getLastTreeWidth() {
		return lastTreeWidth;
	}
	/**
	 * Returns the preference mananger used by this preference dialog.
	 *
	 * @return the preference mananger
	 */
	public PreferenceManager getPreferenceManager() {
		return preferenceManager;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferencePageContainer#getPreferenceStore()
	 */
	public IPreferenceStore getPreferenceStore() {
		return preferenceStore;