next: bail out early in `hg next --evolve` if dirty wdir
This patch adds logic to bail out early when --evolve is passed with next
command and the working directory is dirty.
This will help us in preventing the message saying `do you want --merge` which
is useless and misleading when `--evolve` is passed.
tests: add test of `hg next --evolve` with dirty working directory
I was testing some output change to `hg next --evolve` in dirty working
directory and found that we don't have any test for that.