如何让appHelper的更新触发renderer的重新渲染？

在renderer的上下文中有一个按钮，会动态给apphelper中的值更新。



可以看到appHelper中的trigger已经更新了，但是上面的根据trigger值控制显隐的内容却没有发生变化，这是Hello文本的渲染配置：

有什么方法可以让apphelper值的更新动态刷新渲染出的内容呢？

Start by reproducing the renderer button scenario described in the issue and inspect how changes to appHelper.trigger reach the renderer. Trace the renderer update path and the Hello visibility configuration; done means changing appHelper.trigger updates the conditionally rendered content without a manual refresh.

Written by the indexing model from the issue text.