split: handle partial commit of copies when doing split or record
When using split or record, using either interface (text or curses), selecting
portions of the file to be committed/recorded did not work; the entire file was
treated as having been selected. This appears to be because the logic for
handling partial application of the patches relies on knowing what files are
"new with modifications", and it doesn't treat "copy destination" as "new".
Handling renames correctly is more difficult and will be done in a later patch.
Differential Revision: https://phab.mercurial-scm.org/D6767
Martin von Zweigbergk <martinvonz@google.com> [Sun, 01 Sep 2019 23:43:59 -0700] rev 42854
py3: use pycompat.sysargv[0] for instead of fsencode(sys.argv[0])
Yuya noted in a recent review that fsencode(sys.argv[0]) could be
incorrect on Windows.
Differential Revision: https://phab.mercurial-scm.org/D6782