[PATCH] Reversing multiple ways that are members of the same relation is broken

[Teemu Koskinen <teemu.koskinen@…>]

This patch fixes reversing multiple ways that are members of the same relation, and have a role that needs to be changed by ReverseWayTagCorrector. Only the role of the way that was reversed last was saved, as all the changes were made to a state before any of the reversing took place.

The fix was to introduce a new command, ChangeRelationMemberRoleCommand, that only takes the relation, the position of the member, and the new role and changes the relation without making a whole new copy of the relation. This makes it possible to make many modifications to a relation's members roles without executing them at each step (which would make using undo hard).

[stoecker]

In r1617.