Fixed
- Ultra: an essential you've opened and left keeps the fine edge round its
tile. The open essential's drifting colour kept drifting after it was left,
on the layer that is then the tile's edge, which went out of the tile: two
lines sweeping across it (what 2.103.5 meant to fix), then no edge at all.
The colour of the open one turns again, as before 2.103.5 (thanks Bxthesda
and Poumpky).