v0.8.0

Added

• macshot installs its own updates. The Check for Updates item used to open the
  downloads page and leave the rest to the user. It now asks once, fetches the right build
  for this installation — the matching architecture, and the offline build for an offline
  one — shows how far the download has got, puts it in place of the running one and starts
  it again. Where it cannot, it says why and still opens the page: an MSIX is Windows's to
  replace, and a macshot in Program Files would need administrator rights that a
  notification-area app has no business asking for.

Fixed

• A recording could end with a warning and a file of nothing in it. macshot asked
  Windows for a video sample and then waited silently for the screen to change; Windows
  gives a still screen no frames at all, so the wait had no end and the encoder gave up
  having written nothing. Measured on a quiet desktop, nine sample requests in ten arrived
  with nothing new to show. A still screen now repeats the frame it is still showing,
  which is what a recording of it is, and a recording that does fail says what went wrong
  and takes the empty file with it rather than leaving it to be found later.
• Recording held three copies of every frame where one will do, and each was newly
  allocated — a minute of 30fps was eighteen hundred allocations of the size of the screen.
• Editing a large capture grew without limit. Every crop, flip or rotate kept the
  whole picture it replaced so it could be undone, and nothing ever let one go: a dozen
  operations on a 4K screenshot was most of a gigabyte the app would not give back. The
  history is now held to a memory budget rather than to no limit — six hundred steps at an
  ordinary capture size, fifteen at 4K, and never fewer than the one that would be undone
  next.