evolve: simplify some conditional extracted from a changeset of Sushil khanchi <sushilkhanchi97@gmail.com>

evolve: rename some variable ahead of time A refactoring of the content divergence resolution in on its way. use a distinctive name for some variable early to make the change easier to read later.

evolve: add logic to cover --stop when "divergent" relocation in play Changes in test file reflect the added behaviour. The intermediate changeset has been properly cleaned up by the `hg evolve --stop` call.