codeant-ai-for-open-source[bot] commented on PR #38675:
URL: https://github.com/apache/superset/pull/38675#issuecomment-4067106809
## **Sequence Diagram**
This PR centralizes plain legend layout estimation and uses it across
ECharts chart plugins to avoid clipped legends in dashboards. When a plain
legend would overflow, the transform switches to scroll legend mode, with an
extra recalculation pass for horizontal bottom timeseries legends.
```mermaid
sequenceDiagram
participant ChartPlugin
participant LegendUtils
participant ECharts
participant Dashboard
ChartPlugin->>LegendUtils: Send legend items chart size and requested
plain type
LegendUtils->>LegendUtils: Estimate legend rows and required margin
LegendUtils-->>ChartPlugin: Return effective legend type and margin
opt Horizontal bottom timeseries case
ChartPlugin->>LegendUtils: Recompute using expanded margin
LegendUtils-->>ChartPlugin: Return final legend type and margin
end
ChartPlugin->>ECharts: Build options with effective legend and padding
ECharts-->>Dashboard: Render legend without clipping
```
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