Bug 186403 [KeyBindings] provide conflict information to users outside of logging
bundles/org.eclipse.jface/src/org/eclipse/jface/bindings/CachedBindingSet.java
* A map of prefixes (<code>TriggerSequence</code>) to a map of
	 * available completions (possibly <code>null</code>, which means there
	 * is an exact match). The available completions is a map of trigger (<code>TriggerSequence</code>)
	 * to command identifier (<code>String</code>). This value is
	 * <code>null</code> if it has not yet been initialized.
	 */
	private Map prefixTable = null;
	/**
	 * <p>
	 * The list of schemes that were active at the time this binding set was
	 * computed. This list starts with the active scheme, and then continues
	 * with all of its ancestors -- in order. For example, this might look like
	 * ["emacs", "default"].
	 * </p>
	 * <p>
	 * This value will never be <code>null</code>, and it will never be
	 * empty. It must contain at least one element. Its elements cannot be
	 * <code>null</code>.
	 * </p>
	 */
	private final String[] schemeIds;
	/**
	 * The map representing the resolved state of the bindings. This is a map of
	 * a command id (<code>String</code>) to triggers (<code>Collection</code>
	 * of <code>TriggerSequence</code>). This value may be <code>null</code>
	 * if it has not yet been initialized.
	 */
	private Map triggersByCommandId = null;
	/**
	 * Constructs a new instance of <code>CachedBindingSet</code>.