UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/63.0.3239.84 Chrome/63.0.3239.84 Safari/537.36

Steps to reproduce the problem:
1. go to some room on appear.in
2. share the screen, go to the "Application Window" tab

What is the expected behavior?
the "Share your screen" window is not share-able. It will close once you select it, ending the stream.

It doesn't show up on Linux either, I vaguely recall filing a bug on that years ago.

What went wrong?
the "share your screen" window shows up.

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 63.0.3239.84  Channel: n/a
OS Version: 
Flash Version:
 

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