chartjs / chartjs-plugin-zoom / 11959362075 / 1

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Clamp drag rectangle to chart area (#896)

* Clamp drag rectangle to chart area

I believe this is a better UI, and it also fixes some issues with incorrect zoom ranges when dragging the rectangle outside of the chart area.

To help implement this, I copied the clamp helper function from chartjs-plugin-annotation.

Fixes #895

* Combine beginPoint and endPoint to fix ESLint max arguments

* Add a test

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