Bug 265422 [FieldAssist] Field assist hint popup border is black
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/DecoratedField.java
&& decDatas[i].label != null
					&& !decDatas[i].label.isDisposed()) {
				return decDatas[i];
			}
		}
		return null;
	}
	/*
	 * Show the specified text in the hover, positioning the hover near the
	 * specified control.
	 */
	private void showHoverText(String text, Control hoverNear) {
		if (text == null) {
			hideHover();
			return;
		}
		if (hover == null) {
			hover = new Hover(hoverNear.getShell());
		}
		hover.setText(text, hoverNear, control);
		hover.setVisible(true);
	}
	/**
	 * Set a boolean that indicates whether the receiver should use the
	 * decoration registry's maximum decoration width when allocating space for
	 * decorations. The default value is <code>true</code>. Using the maximum
	 * decoration width is useful so that decorated fields on the same dialog
	 * that have different decoration widths will all align. This also allows
	 * client dialogs to align non-decorated fields with decorated fields by
	 * consulting the maximum decoration width.