Bug 106574 [KeyBindings] registry: General/Keys setting not saved or not restored
bundles/org.eclipse.jface/src/org/eclipse/jface/bindings/BindingManager.java
if (existingCache == null) {
			existingCache = bindingCache;
			cachedBindings.put(existingCache, existingCache);
		}
		Map commandIdsByTrigger = existingCache.getBindingsByTrigger();
		if (commandIdsByTrigger != null) {
			if (DEBUG) {
				System.out.println("BINDINGS >> Cache hit"); 
			}
			setActiveBindings(commandIdsByTrigger, existingCache
					.getTriggersByCommandId(), existingCache.getPrefixTable());
			return;
		}
		
		if (DEBUG) {
			System.out.println("BINDINGS >> Cache miss"); 
		}
		
		commandIdsByTrigger = new HashMap();
		final Map triggersByParameterizedCommand = new HashMap();
		computeBindings(activeContextTree, commandIdsByTrigger,
				triggersByParameterizedCommand);
		existingCache.setBindingsByTrigger(commandIdsByTrigger);
		existingCache.setTriggersByCommandId(triggersByParameterizedCommand);
		setActiveBindings(commandIdsByTrigger, triggersByParameterizedCommand,
				buildPrefixTable(commandIdsByTrigger));
		existingCache.setPrefixTable(prefixTable);
	}
	/**
	 * <p>