[Bug]: Legend tool tip doesn't work when there's a single group

[Vkrishnasree]

Relevant package(s)

• @carbon/charts
• @carbon/charts-svelte
• @carbon/charts-react
• @carbon/charts-angular
• @carbon/charts-vue
• Documentation website

Carbon Charts Version

1.14.1

Which bundler are you using?

None (UMD)

What happened and what did you expect to happen?

When there's only a single group in dataset, and legend name is long and truncated, tool tip doesn't appear on hovering over legend.
When there's multiple groups in the dataset, tooltip works as expected on hovering

Chart data and options (automatically formatted so no need for backticks)

export default {
  title: 'Vertical stacked bar (time series)',
  axes: {
    left: {
      mapsTo: 'value',
      stacked: true
    },
    bottom: {
      mapsTo: 'date',
      scaleType: 'time'
    }
  },
  height: '400px'
}


export default {
  title: 'Vertical stacked bar (time series)',
  axes: {
    left: {
      mapsTo: 'value',
      stacked: true
    },
    bottom: {
      mapsTo: 'date',
      scaleType: 'time'
    }
  },
  height: '400px'
}

JavaScript console or build output (if relevant)

No response

StackBlitz repro

https://stackblitz.com/edit/aaqy1h?file=data.js,options.js

IBM Application/Team (if relevant)

No response

What priority level would this be in your opinion?

P3 (Low)

[chrisdudley]

possibly dupe of #1885 (or at least related) ?