setter 面板更新，画布不更新


如图所示，setter 面板更新了，但是画布不更新，要点击刷新后才更新，是什么问题呢？

Start by reproducing the reported behavior in the setter panel and canvas: change a setting, observe whether the canvas updates, and compare it with clicking refresh. Trace the update path between those entry points; done means setter changes are reflected in the canvas without a manual refresh, with a regression test if the existing test structure supports it.

Written by the indexing model from the issue text.