I often use Picture in Picture to view things like Youtube videos or streams in a small window in the corner while playing games, and it works well, except for when the mouse enters the Picture in Pictur window and takes focus from the game, dragging the PiP window instead of clicking in the game. It would be really great to have an option on the Picture in Picture controls to lock the window in place, and prevent mouse interaction, apart from the control buttons themselves. I've attached a rough idea of what i mean.
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