Chrome error when EditorJs is loaded in an iframe

[damacisaac]

See #2675.

This issue is preventing use of the library when inside of an iframe that is out of our control.

[neSpecc]

Please, add more details. How to reproduce the problem?
I've tested this code and the editor is working fine in there

<iframe src="https://editorjs.io" frameborder="0" width="100%" height="700px"></iframe>

[damacisaac]

@neSpecc It works almost fine, but the [ + ] button does not appear beside blocks. I tried just now with your example in a random http://localhost:8000 site and was able to see the error in the console logs and the button does not appear.

[welcomeapp]

Is there any information on how to fix this bug? There is no access to the iframe settings and [+] is not displayed and the error

[damacisaac]

the fix is to merge this PR: #2790

[damacisaac]

@neSpecc can we get that PR merged?