Bug 129214 [Field Assist] - Decorated Field attachments not centering images horizontally
DecoratedField is supposed to center decorations horizontally on each side. The current attachments are not doing so. Also consider whether grid would have been a better choice for internal implementation.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/DecoratedField.java
}
	/**
	 * Hide the specified decoration. This message has no effect if the
	 * decoration is already hidden, or was not already added to the field using
	 * <code>addFieldDecoration</code>.
	 * 
	 * @param decoration
	 *            the decoration to be hidden.
	 */
	public void hideDecoration(FieldDecoration decoration) {
		FieldDecorationData data = getDecorationData(decoration);
		if (data == null)
			return;
		
		
		
		data.visible = false;
		setVisible(data, false);
	}
	/**
	 * Update the specified decoration. This message should be used if the image
	 * or description in the decoration have changed. This message has no
	 * immediate effect if the decoration is not visible, and no effect at all
	 * if the decoration was not previously added to the field.
	 * 
	 * @param decoration
	 *            the decoration to be hidden.
	 */
	public void updateDecoration(FieldDecoration decoration) {
		FieldDecorationData data = getDecorationData(decoration);