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
this.label = label;
			this.data = formData;
			this.showOnFocus = showOnFocus;
		}
	}
	/**
	 * Decorations keyed by position.
	 */
	private FieldDecorationData[] decDatas = new FieldDecorationData[DECORATION_SLOTS];
	/**
	 * The associated control
	 */
	private Control control;
	/**
	 * The composite with form layout used to manage decorations.
	 */
	private Composite form;
	/**
	 * The boolean that indicates whether the maximum decoration width is used
	 * when allocating space for decorations.
	 */
	private boolean useMaxDecorationWidth = true;
	/**
	 * The hover used for showing description text
	 */
	private Hover hover;
	/**
	 * The hover used to show a decoration image's description.
	 */
	class Hover {