JS Error when pasting a post (shortcode related)

[youknowriad]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce

• Try pasting the following post into the visual editor of Gutenberg
  https://gist.github.com/florianbrinkmann/4e9e4d23eaefb8b23484badddd848196
• Notice a JS error on the console

Screenshots

cc @iseulde @jorgefilipecosta

[wpaustria]

This issue came up during that discussion:
#11782
Here are the videos which belong to this issue:

• https://www.youtube.com/watch?v=lttL0TxPFbU&feature=youtu.be
• https://www.youtube.com/watch?v=HwFnG77QOvk&feature=youtu.be
• https://www.youtube.com/watch?v=gTMHEAs68Mc&feature=youtu.be
• https://www.youtube.com/watch?v=W-X6hPB4OfY&feature=youtu.be

[jorgefilipecosta]

I'm having problems reproducing the JS error, (although the pasting of this content is very slow). @wpaustria what software are you copying the content from? Does the JS error also happen if the content is pasted using cmd+shift+v (or equivalent in your keyboard)? Thank you for all the help debugging this issue.

[youknowriad]

@jorgefilipecosta I reproduced this error by copying the whole content, clicking the appender, and pasting.

[wpaustria]

@jorgefilipecosta As shown in the videos, I copied the content with CMD+C/CMD+V and with the context menu. Both ways don't work.
Software: Firefox 64 & latest Chrome & latest Chromium on Ubuntu 18.10.
I copied the content from a website, have a look:

https://gist.github.com/florianbrinkmann/4e9e4d23eaefb8b23484badddd848196

This is called the infamous "The Florian Brinkmann article".
Which shows copying is very slow. Before the latest changes copying this content to Gutenberg was impossible!