[Webkit-unassigned] [Bug 198040] New: getDisplayMedia can fail when called from a user gesture handler

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198040

            Bug ID: 198040
           Summary: getDisplayMedia can fail when called from a user
                    gesture handler
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: philipp.weissensteiner at visocon.com
                CC: youennf at gmail.com

Created attachment 370251

  --> https://bugs.webkit.org/attachment.cgi?id=370251&action=review

getDisplayMedia example

Hi,

Since Safari Tech Preview 82 

> getDisplayMedia must be called from a user gesture handler.

If said handler has an async call to say getUserMedia or enumerateDevices, before
invoking getDisplayMedia, the call will always fail with the above message.

```javascript
//  my user gesture handler is called after a button is clicked
async function myUserGestureHandler() {
  // both will cause a failure
  // const camera = await navigator.mediaDevices.getUserMedia({ video: true });
  const devices = await navigator.mediaDevices.enumerateDevices();

  // calling getUserMedia here works
  const screen = await navigator.mediaDevices.getDisplayMedia({ video: true });
}
```

- Invoking getUserMedia works.
- Recent Firefox and Chrome versions work too.
- Worked in Safari Tech Preview 81.

I've attached an example page demonstrating the issue.

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