1.13.5

Fixed

• Pointing at a track or photo no longer rebuilds its popup on every pointer
  sample. Each pointer position was rebuilding the note popup once per
  overlapping layer, for the feature that was already showing — measured at 508
  rebuilds and 1.9 seconds of work for one sweep along a single track, about 90%
  of everything that pointer movement cost. The popup is now raised once when
  the pointer reaches a feature and left alone until it reaches another: the
  same sweep costs 9 rebuilds and 44 ms, and each pointer sample went from
  5.2 ms to 0.4 ms. As part of this the popup stays where the pointer entered a
  track instead of sliding along under the cursor, which is what a marker's own
  popup has always done.

• A photo lying on its own track now names the photo on hover, not the
  track. Clicking there already gave photos precedence; pointing did not, so
  the two could disagree about what was under the cursor.