rebase: fix incompatible options error message
In commit f57696802c30 ("rebase: really just passthru the `git am` options", 2018-11-14), the handling of `git am` options was simplified dramatically (and an option parsing bug was fixed), but it introduced a small regression in the error message shown when options only understood by separate backends were used: $ git rebase --keep --ignore-whitespace fatal: cannot combine interactive options (--interactive, --exec, --rebase-merges, --preserve-merges, --keep-empty, --root + --onto) with am options (.git/rebase-apply/applying) $ git rebase --merge --ignore-whitespace fatal: cannot combine merge options (--merge, --strategy, --strategy-option) with am options (.git/rebase-apply/applying) Note that in both cases, the list of "am options" is ".git/rebase-apply/applying", which makes no sense. Since the lists of backend-specific options is documented pretty thoroughly in the rebase man page (in the "Incompatible Options" section, with multiple links throughout the document), and since I expect this list to change over time, just simplify the error message. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>