Temporarily expand all dives so the automatic width calculation works

Suggested-by: Tomaz Canabrava <tcanabrava@kde.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Select the first dive

This works regardless whether the first dive is in a trip or not.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Fix Mac build

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>