fix focus trap when entering Presenter mode

[thescientist13]

Type of Change

• New Feature Request
• Improvement / Suggestion
• Bug
• Other (please clarify below)

Summary

When going into Presenter mode, if you click the mouse such that the focus moves to the <iframe> moving left / right through the slides doesn't work.

Details

Not sure if this is just a matter of making sure all events bubble up? I know the <iframe> is in a shadow root, maybe that's why the events don't capture? Which is interesting, since the event handler is also set within a shadow DOM though? 🤔

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Somewhat related maybe, but if an alternative to the <iframe> is found as part of #8 , then maybe this problem goes away?