For Picture-in-Picture, we use an always-on-top window to keep the video player on top of other applications.
For users that use workspaces on macOS, this is only a half-measure, since it's easy to lose the player window between workspaces. Ideally, the player window should persist between workspaces.
Chromium is able to do this with their non-native player window, so we can likely leverage the same technique.
The priority flag is not set for this bug.
:spohl, could you have a look please?
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I just rechecked in latest Dev Edition. The way picture-in-picture is implemented is of no use to a mac user if he is using apps in fullscreen mode and across multiple workspaces.
Picture-in-picture should behave like Helium does. For reference see https://github.com/JadenGeller/Helium
Besides that... Great Feature!