100pah commented on PR #20161:
URL: https://github.com/apache/echarts/pull/20161#issuecomment-2233732870
Just some extra records of this case:
It seems to be caused by:
```js
const oldData = this._data;
// ...
const changePolyState = (toState: DisplayState) => {
this._changePolyState(toState);
};
data.eachItemGraphicEl(function (el) {
el && ((el as ECElement).onHoverStateChange = changePolyState);
});
```
A closure of `changePolyState` references to `oldData`, and `oldData`
references to the previous `changePolyState`s.
As a result, all of the `oldData`s are not released.
<img width="431" alt="image"
src="https://github.com/user-attachments/assets/515047a5-058e-49eb-978b-d24c996bc26a";>
---
Theoretically, it's need to check whether is kind of case occurs in other
`render` functions that contain `oldData` and element listener.
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