[Bug] Charts with transparent backgrounds renders on top of the previous chart

[Coreusa]

There's a bug with all diagram types:

Use this as options:

      schartOptions: {
        title: 'Chart example',
        bgColor: 'transparent'
      }

If you update the chart data reactive, the new chart gets rendered on top of the next one. Even initially it looks phoobar. Like this:

If you keep updating the data (empty the array then create new values), it gets worse:

Here's the same, but with the pie diagram. It looks better initially...

However, keep updating the data (empty the array then create new values), the next update renders the chart on top of the previous one:

This makes me think you're not doing proper house cleaning when updating the chart, something that isn't apparent when using a background color (which effectively hides what's behind the top-most chart).

You should look into this.