Bug 55592 [Contributions] SubActionBars does not properly handle menu listeners
bundles/org.eclipse.jface/src/org/eclipse/jface/action/SubMenuManager.java
}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.action.IContributionItem#isEnabled()
	 */
	public boolean isEnabled() {
		return isVisible() && getParentMenuManager().isEnabled();
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.action.IContributionItem#isGroupMarker()
	 */
	public boolean isGroupMarker() {
		return getParentMenuManager().isGroupMarker();
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.action.IContributionItem#isSeparator()
	 */
	public boolean isSeparator() {
		return getParentMenuManager().isSeparator();
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.action.SubContributionManager#isVisible()
	 */
	public boolean isVisible() {
		return super.isVisible() && getParentMenuManager().isVisible();
	}
	/**
	 * Remove all contribution items.
	 */
	public void removeAll() {
		super.removeAll();