DOM events called multiple times for each occurrence of PDFJS.webViewerLoad()

[curiosity26]

Link to PDF file (or attach file here):
Any PDF causes this issue

Configuration:

• Web browser and its version: Chrome 58
• Operating system and its version: Mac OS X 10.12.5
• PDF.js version: 1.8.448
• Is an extension: No

Steps to reproduce the problem:

1. Configure PDF.js in a single page app
2. Configure a way to generate a DOM element to render the PDF.js viewer by calling PDFJS.webViewerLoad(url)
3. Configure a way to destroy the the DOM element
4. Toggle on the Element
5. Click Download - 1 document should download
6. Toggle the element off and on again
7. Click Download - 2 documents download
8. Repeat Steps 6 and 7, another document downloads with each call of PDFJS.webViewerLoad(url)

What is the expected behavior? (add screenshot)
Only one PDF should download each time

What went wrong? (add screenshot)
Multiple PDF's downloaded

[yurydelendik]

What's PDFJS.webViewerLoad?

We are exposing PDFViewerApplication which has open() method to accomplish the same.

[curiosity26]

I apologize, I was looking at an angular script that wraps the PDFJS library.

The call is actually: PDFViewerApplication.run(config)

[yurydelendik]

This issue looks out of scope of this project. I'll close it. (PR #8525 sounds like a good idea, but requires more work) I'm thinking this issue similar to #8402, so this one can be addressed but fixing the latter.