Subtitles 1.21.0

• Choose how long the box stays up. Settings ▸ UI ▸ Subtitle Box has
  a new Hide after slider, under Blur. Once nothing new is said, the box
  fades after 4 to 20 seconds; 4 is the default, as before.
• The offer to save the transcript still comes. With a long Hide
  after, the ⌥ stack waits for the box to fade and for the offer to save
  the transcript to run its course before it is forgotten, even past
  Clear after.