New study screen is blocking some of the JavaScript features

[ZornHadNoChoice]

See https://forums.ankiweb.net/t/new-study-screen-is-blocking-some-of-the-javascript-features/67530.

Brayan asked for this issue.

[BrayanDSO]

For context, the issue doesn’t happen if the focusin and focusout listeners are disabled (source).

I don’t know why they cause the issue, but they do.

They are currently necessary to avoid disabling keypress detection for commands if the webview is focused, which is an improvement over the old reviewer.