evolve: fix stabilization of orphan merge changesets in case of conflicts
As demonstrated by tests added in previous patch, if one of the parent of a
merge changeset has a new version and merge changeset gets, running `hg evolve`
to stabilize that if results in conflicts will lead to lose of other parent of
that merge changeset when we resolve conflicts and do `hg evolve --continue`.
This patch fixes the behavior, by checking whether we are continuing evolving a
merge changeset and if yes, setting the dirstate parents according to that.
[flake8]
ignore =
#closing bracket does not match indentation of opening bracket's line
E123,
# closing bracket does not match visual indentation
E124,
# visually indented line with same indent as next logical line
E129,
# at least two spaces before inline comment
E261,
# too many leading '#' for block comment
E266,
# expected 2 blank lines, found 0
E302,
# expected 2 blank lines after end of function or class
E305,
# module level import not at top of file
E402,
# line too long (82 > 79 characters)
E501,
# do not assign a lambda expression, use a def
E731,
# class names should use CapWords convention
N801,
# line break occurred before a binary operator
W503
builtins=xrange, execfile