Update Coordinates - Always Redraw

I'm attempting to track the coordinates of a function, but I don't seem to be able to get always_redraw as it is not defined to work. Is this a new feature?

```
def construct(self):
self.wait()
self.setup_axes()
graph = self.get_graph(lambda x: x**3, x_min=-5, x_max=5)

initial_x = -5
final_x = 5
track = ValueTracker(initial_x)

coor = self.coords_to_point
dot = track.get_value
func = graph.underlying_function
moving_dot = always_redraw(lambda: Dot(coor(dot(), func(dot()))))

self.add(graph, moving_dot)
self.play(track.set_value, final_x, run_time=5)
self.wait()
```

在manim代码库中查找 'always_redraw' 的定义，可能在像 mobject/updaters.py 或 scene/scene.py 这样的模块中。检查它是否被导入，或者是否有类似 'always_redraw' 的装饰器或函数替代方法。运行提供的代码片段查看错误，并通过确保 dot 使用 ValueTracker 更新来验证修复。

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