evolvecmd: fix broken `evolve --continue` ran after `next --evolve`
Recent series broke `evolve --continue`in cases when run after `hg next
--evolve`. The previous patch adds test demonstarting the broken behaviour, this
patch fixes that by storing the command which leads us to evolve --continue in
the evolvestate.
#require test-repo pyflakes
Copied from Mercurial core (60ee2593a270)
$ cd "`dirname "$TESTDIR"`"
run pyflakes on all tracked files ending in .py or without a file ending
(skipping binary file random-seed)
$ hg locate 'set:(**.py or grep("^#!.*python")) - removed()' 2>/dev/null \
> | xargs pyflakes 2>/dev/null