Bug 126414 [Commands] handlers: Provide help context ids
For commands and handlers to replace actions, they need to be capable of providing help context identifiers. For an example, see OpenResourceHandler in org.eclipse.ui.ide. This help context id will need to be definable through XML and through code.
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/CommandEvent.java
return ((changedValues & CHANGED_CATEGORY) != 0);
	}
	/**
	 * Returns whether or not the handled property changed.
	 * 
	 * @return <code>true</code>, iff the handled property changed.
	 */
	public final boolean isHandledChanged() {
		return ((changedValues & CHANGED_HANDLED) != 0);
	}
	/**
	 * Returns whether or not the parameters have changed.
	 * 
	 * @return <code>true</code>, iff the parameters property changed.
	 */
	public final boolean isParametersChanged() {
		return ((changedValues & CHANGED_PARAMETERS) != 0);
	}
	
	/**
	 * Returns whether or not the return type property changed.
	 * 
	 * @return <code>true</code>, iff the return type property changed.
	 * @since 3.2
	 */
	public final boolean isReturnTypeChanged() {
		return ((changedValues & CHANGED_RETURN_TYPE) != 0);
	}
}