Can't use utf-8/unicode symbols in modeConfig.formatTooltip when using Measure modes

[Ivan Palatov]

Describe the bug

When using utf-8 symbols such as ² they get ignored in modeConfig.formatTooltip property of measure modes (eg. MeasureDistanceMode).

Actual Result

There are no utf symbols shown

Expected Result

The special characters should be shown

Reproduce Steps

1. Set mode to MeasureDistanceMode
2. Set modeConfig.formatTooltip to

(distance) => `${distance} m²`

4. Done

[Ivan Palatov]

For future refs, the problem was solved by setting characterSet: 'auto' in tooltips subLayerProps:

new EditableGeoJsonLayer({
  id: 'editable-geojson',
  // ... other params,
  _subLayerProps: {
    tooltips: {
      characterSet: 'auto'
    }
  }
});