Unexpected border lines around bar elements

[narlack]

Expected Behavior

Chart.js drawing bar element without unexpected border lines

Current Behavior

Chart.js drawing bar element with border lines in the versions started from 2.8.0 (version 2.7.3 is okey)

Steps to Reproduce (for bugs)

• v.2.9.3: https://stackblitz.com/edit/chartjs-v2-9-3
  

• v.2.8.0: https://stackblitz.com/edit/chartjs-v2-8-0
  

• v.2.7.3: https://stackblitz.com/edit/chartjs-v2-7-3
  

Context

Environment

• Chart.js version: >2.8.0
• Browser name and version: Chrome 79 (79.0.3945.117) & IE 11
• Configuration:

{
  type: 'bar',
  data: {
    labels: ['Dateset 1', 'Dateset 2', 'Dateset 3', 'Dateset 4', 'Dateset 5'],
    datasets: [
    {
      label: 'green',
      data: [308.38, 265.49, 272.79, 306.44, 336.44],
      backgroundColor: 'green',
      borderColor: 'white',
      borderSkipped: false,
      borderWidth: 6,
      hoverBorderWidth: 6
    },
    {
      label: 'red',
      data: [391.4, 427.41, 296.67, 351.51, 380.83],
      backgroundColor: 'red',
      borderColor: 'white',
      borderSkipped: false,
      borderWidth: 6,
      hoverBorderWidth: 6
    },
    {
      label: 'black',
      data: [386.08, 512.74, 331.05, 380.83, 445.68],
      backgroundColor: 'black',
      borderColor: 'white',
      borderSkipped: false,
      borderWidth: 6,
      hoverBorderWidth: 6
    },
    {
      label: 'blue',
      data: [340.7, 568.65, 454.08, 284.27, 640.98],
      backgroundColor: 'blue',
      borderColor: 'white',
      borderSkipped: false,
      borderWidth: 6,
      hoverBorderWidth: 6
    },
    {
      label: 'rebeccapurple',
      data: [280.79, 595.62, 516.52, 379.53, 735.92],
      backgroundColor: 'rebeccapurple',
      borderColor: 'white',
      borderSkipped: false,
      borderWidth: 6,
      hoverBorderWidth: 6
    }
  ]
}

If it's planned behavior, although line looks strange. Lines aren't drawing on the all sides always.

[kurkle]

On a side note, instead of using white borders to get padding to bars, you can use various options to control the bar sizes: https://www.chartjs.org/docs/latest/charts/bar.html#dataset-configuration