Make video sticky on desktop so you can scroll the comments while still watching it

[insin]

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[insin]

This CSS unsticks the header, makes the video half of view height and allows comments to scroll underneath it

• Requires Cinema mode
• The video needs to be forced to reflow after the style is applied
• This breaks fullscreen display

So we need to be able to:

• track status of & automatically enable Cinema mode (which also gives us Automatically use cinema mode on desktop #29)
• track fullscreen status

ytd-watch-flexy[full-bleed-player] #full-bleed-container.ytd-watch-flexy {
  max-height: 50vh;
  aspect-ratio: 16/9;
  position: sticky;
  top: 0;
  /* Display video on top of scrolled content */
  /* This specific value is needed to cover the channel name */
  z-index: 301;
  min-height: unset;
}

#masthead-container.ytd-app {
  position: static;
}

#page-manager.ytd-app {
  margin-top: 0 !important;
}