1.13.6

Added

• Reading a photo is now remembered between sessions. What came out of a
  photo — its coordinate, altitude, the moment, the datum its tags stated,
  orientation, and whether it has a thumbnail — is kept in one file beside the
  plugin's settings, so opening the vault again draws the same pins without
  opening the photos. On a base of 12,107 photos that is 12,107 file reads and
  about 8.5 seconds on every start, down to 20 reads and 1.2 seconds, with the
  same 6,504 points and the same thumbnails on screen. Photos found to carry no
  GPS are remembered as such rather than re-read to re-learn it every time —
  5,603 of that base, or nearly half of it.

  The thumbnail images themselves are not stored; they are read on demand for
  the handful of photos the map is actually displaying, so the file stays small
  whatever size the album is. Because the raw tag values are kept rather than the
  converted result, changing Photo coordinate system now moves every point
  without reopening a single photo.

  An entry is used only while its file still reports the same path, size and
  time, so an edited, renamed or deleted photo is never drawn from it. The file
  is a cache and nothing else: Clear the photo index in settings throws it
  away, deleting it by hand does the same, and either way every map goes on
  showing exactly what it showed.

Fixed

• A map of thousands of photos no longer reads them all at once. A base
  whose results are photo files made the number of files being read at one time
  follow the size of the result — twelve thousand concurrent reads where the
  code was written for a few hundred. Reads are now bounded, and a refresh that
  has been superseded stops starting new ones instead of draining its queue.

• A map with nothing on it no longer raises an error from the built-in Maps
  view. Its marker manager reports empty bounds as a real object rather than
  as nothing, which the built-in view then treats as a real extent; at large
  result counts this surfaced as errors in the console. Advanced Maps now hands
  it the shape it already handles.