Line chart - a part of a line is cut at the top

[theunreal]

Expected Behavior
line chart to display the whole line with same width

Current Behavior
seems line chart displays a 1 px line on the top and bottom in chart.js 2.7.2

Possible Solution
Steps to Reproduce (for bugs)
example of the issue (chart.js 2.5) can be found in https://jsfiddle.net/e8n4xd4z/118/, both top and bottom width are thinner than expected.

Version (chart.js 2.4) is working fine https://jsfiddle.net/e8n4xd4z/117/,

Environment
Chart.js version: 2.7.2
Browser name and version: Chrome 55, IE 10
Link to your project:https://jsfiddle.net/e8n4xd4z/118

[michalkolek]

#4790

[etimberg]

Closing as duplicate of #4790