imageURI width parameter doesn't work as expected

[andrussuitsu]

Description

The width parameter to imageURI API call applies to the canvas but the image within the canvas still has the same original size.

Steps to Reproduce

1. Open codepen https://codepen.io/andrussuitsu/pen/azoEZKB
2. It will open a separate tab containing the image exported using imageURI API call.

Expected Behavior

I expect the chart to be scaled so that it will fill the 4096 area. I need this for exporting the image with a better resolution.

Actual Behavior

The chart still looks the same width, it is just on a larger canvas now.

Screenshots

Please look at the codepen link.

Reproduction Link

https://codepen.io/andrussuitsu/pen/azoEZKB