Bug and Feature to Allow Fix a Floating Preview without hide

[aek]

I will be great if there could be a way to define that a Task Window Preview could be floating and prevent the hide of the selected ones.
I'm seeing something like this already happening when you put a video into fullscreen, Alt+Tab to another window and then clic on the task button of the fullscreen video in the browser. This will make the preview of the task to stay open until you clic again in the same task button icon of the fullscreen video in the browser. Also When you have multiple fullscreen videos in different browser windows you couldn't be able to properly clic in the task button icons to switch on the windows until you clic and hide the first one that produce the Preview, that it's very weird behavior.
I think that it should work without cancelling the first Preview window and also it will be great to have a way to manage the Preview to remain open until being closed manually