evolve: don't use python sets on top of revset for evolve --rev In --rev we were wrapping the revsets in python sets. This is wrong as the use python sets force the wrapper revision set to be computed earlier than it has to and have no order guarantee. Removing this wrapping changes a test because the ordering does not appear to be the same but the end result is the same.

test-drop.t
test-simple4server.t
tests/test-simple4server-bundle2.t