Fix DOMElement for retina screens

[mattcolman]

This fixes DOMElement for retina screens.

For example if you make your canvas retina aware like this:

var width = 900
var height = 400
var canvas = document.getElementById("canvas");
canvas.style.width = width
canvas.style.height = height
canvas.width = width * devicePixelRatio // value of devicePixelRatio can be seen in the code from BrowserDetect.getDeviceRatio()
canvas.height = height * devicePixelRatio

Then the Easel stage is rendered with crisp text and vector shapes on your retina screen, but DOMElement is positioned and scaled incorrectly.
This PR fixes that.

[kahwee]

I am encountering this problem too. Can this pull request be accepted?

[ndevr]

Can this pull request be accepted?

[kaushalc]

Is this available in the NextVersion ? I am also facing this issue.

[lannymcnie]

Appreciate the PR -- but the implementation of an internal private class with one method is definitely non-standard. I would recommend just adding this as a method of DOMElement for now, and it might make sense to pull it out into a separate utility function/class (like utils/extend or any other single-method class in utils/).

[mattcolman]

I'll take a look at cleaning this up

[mattcolman]

@lannymcnie cleaned it up.
Finally worked out the formatting! 🤣

[kaushalc]

@lannymcnie I am facing this retina issue. I see there are some conflicts. Can this be resolved?