Bug 265422 [FieldAssist] Field assist hint popup border is black
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ControlDecoration.java
* @return <code>true</code> if a hover popup containing the decoration's
	 *         description text should be shown when the user hovers over the
	 *         decoration, and <code>false</code> if a hover should not be
	 *         shown.
	 */
	public boolean getShowHover() {
		return showHover;
	}
	/**
	 * Set the boolean that controls whether the decoration's description text
	 * should be shown in a hover when the user hovers over the decoration. The
	 * default value of this setting is <code>true</code>.
	 * 
	 * @param showHover
	 *            <code>true</code> if a hover popup containing the
	 *            decoration's description text should be shown when the user
	 *            hovers over the decoration, and <code>false</code> if a
	 *            hover should not be shown.
	 */
	public void setShowHover(boolean showHover) {
		this.showHover = showHover;
		update();
	}
	/**
	 * Get the margin width in pixels that should be used between the decorator
	 * and the horizontal edge of the control. The default value of this setting
	 * is <code>0</code>.
	 * 
	 * @return the number of pixels that should be reserved between the
	 *         horizontal edge of the control and the adjacent edge of the