Longpress on mobile devices for sharing and copying isn't possible

[TRMSC]

Sharing and copying of qr codes on mobile devices by doing a longpress is not possible yet.
It is obvious that there is a problem with:

<div>
    <img...>
    <canvas...></canvas>
    <img...>
</div>

Maybe there are appropriate issues or open pull-requests in the qrcode.js-repository?

• IMG src has no value, resulting in a blank canvas
• Why use this tool to generate two-dimensional code will have the probability of the problem of messy code
• Solved multiple canvas issue

But it also could be that a completely different solution is necessary...