evolve: delete redundant and incorrect code for updating dirstate In relocate() when we notice conflicts, we will try to fix up the dirstate by calling copies.duplicatecopies() and dirstatedance(). However, we had called _evolvemerge() just before that point and that has already fixed up the dirstate, so there's no need to do it again. Also, we did it incorrectly as the test case shows.

tests: demonstrate how evolve loses transitive copies when interrupted Let's say `b` has been renamed to `c` in commit A and then renamed to `d` in commit B. We now modify A in a way that will cause a conflict when we evolve B. `hg evolve` will now stop and let the user resolve the conflicts, but it will have lost the copy information in the working copy (should still be c->d).

evolve: use ui.configoverride() instead of ui.backupconfig() ui.configoverride() was added in hg 4.1. util.nullcontextmanager() was added in hg 4.4.

topic: use ui.configoverride() instead of ui.backupconfig() ui.configoverride() was added in hg 4.1. util.nullcontextmanager() was added in hg 4.4.

topic: use ui.configoverride() instead of ui.backupconfig() ui.configoverride() was added in hg 4.1. util.nullcontextmanager() was added in hg 4.4.

evolve: use ui.configoverride() instead of ui.backupconfig() ui.configoverride() was added in hg 4.1.

evolve: remove obsolete backup of allowemptycommit config We stopped setting the config in 88601e1cd5d8 (evolve: create new commit while resolving content-divergence, 2018-04-23), so there's no need to back it up.