- A resized edge keeps its own pass of the repeated hour, else the other
edge's, so an end pulled into the hour an event started in its second pass
no longer lands before the start.
- A drafted block opens the form at its real length rather than the end it is
drawn to, so a draft ending in the repeated hour keeps its length and one
starting in the spring-forward gap no longer ends before it starts.
- A form only keeps an offset for a time in the repeated hour, so a day move
doesn't depend on the season of the occurrence it came from and a time
changed and changed back compares equal again.
- Changing the form's zone, or going all-day, drops a kept pass.
- A drag works out the event's pass once instead of every frame.
- The form caches the pinned-zone check and the time labels again.
- Tests cover the pinned event's local times again.