Bug 284330 [JFace] Add isVisible API to ControlDecoration
Build ID: 3.5 Steps To Reproduce: This is an enhancement request. I would like to be able to programmatically determine if a ControlDecoration is visible. This is especially useful for testing.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ControlDecoration.java
* Hide the control decoration and any associated hovers. This message has
	 * no effect if the decoration is already hidden.
	 */
	public void hide() {
		if (visible) {
			visible = false;
			hideHover();
			update();
		}
	}
	/**
	 * Get the description text that may be shown in a hover for this
	 * decoration.
	 * 
	 * @return the text to be shown as a description for the decoration, or
	 *         <code>null</code> if none has been set.
	 */
	public String getDescriptionText() {
		return descriptionText;
	}
	/**
	 * Set the image shown in this control decoration. Update the rendered
	 * decoration.
	 * 
	 * @param text
	 *            the text to be shown as a description for the decoration, or
	 *            <code>null</code> if none has been set.
	 */
	public void setDescriptionText(String text) {
		this.descriptionText = text;