histedit: convert pick action into a class
This converts the pick action into a histeditclass instance, as part of an
ongoing effort to refactor histedit for maintainability and robustness.
The test output changed because previously pick would only report the commit
disappearing if there were no merge conflicts. Now that we've unified the normal
and the --continue flows, they act the same and we get the warning even after
--continue.
#require serve killdaemons
#if windows
$ hg clone http://localhost:$HGPORT/ copy
abort: * (glob)
[255]
#else
$ hg clone http://localhost:$HGPORT/ copy
abort: error: Connection refused
[255]
#endif
$ test -d copy
[1]
$ python "$TESTDIR/dumbhttp.py" -p $HGPORT --pid dumb.pid
$ cat dumb.pid >> $DAEMON_PIDS
$ hg clone http://localhost:$HGPORT/foo copy2
abort: HTTP Error 404: * (glob)
[255]
$ "$TESTDIR/killdaemons.py" $DAEMON_PIDS