v2.0.0-beta.16

2.0.0-beta.16

Added

• A video shows at its size as soon as that is known, from its server preview,
  or from the few bytes of an mp4 or mov that hold it, with its poster while it
  buffers. The slideshow holds until it can play (#114, #104)

Fixed

• Preloading the next or previous video no longer reads all of it: an mp4
  with its index at the end had the browser fetch the whole file. Box headers
  are read to find the index, and a sound's metadata is only read when its
  index comes first. Nothing is preloaded with data saver on
  (#114, nextcloud/viewer#2284)
• The files next to the one shown are preloaded once it has loaded, rather
  than competing with it (#114)
• An update of the file shown that carries the version already on screen no
  longer remounts its element: Text rebuilt its editor on each of its own
  saves (#119)