Bug 126527 [Field Assist] - API - Field Decoration alignment issues are different for cell editors
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/DecoratedTextCellEditor.java
/**
	 * The text control; initially <code>null</code>.
	 */
	protected Text text;
	/**
	 * The decorated field used to show the content assist cue.
	 */
	private DecoratedField decoratedField;
	private ModifyListener modifyListener;
	/**
	 * State information for updating action enablement
	 */
	private boolean isSelection = false;
	private boolean isDeleteable = false;
	private boolean isSelectable = false;
	/**
	 * Default TextCellEditor style specify no borders on text widget as cell