rebase: prefer --default-prefix to --{src,dst}-prefix for format-patch

When git-rebase invokes format-patch, it wants to make sure we use the
normal prefixes, and are not confused by diff.noprefix or similar. When
this was added in 5b220a6 (Add --src/dst-prefix to git-formt-patch
in git-rebase.sh, 2010-09-09), we only had --src-prefix and --dst-prefix
to do so, which requires re-specifying the prefixes we expect to see.
These days we can say what we want more directly: just use the defaults.

This is a minor cleanup that should have no behavior change, but
hopefully the result expresses more clearly what the code is trying to
accomplish.

Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: peff

builtin/rebase.c

@@ -660,7 +660,7 @@ static int run_am(struct rebase_options *opts)
 	format_patch.git_cmd = 1;
 	strvec_pushl(&format_patch.args, "format-patch", "-k", "--stdout",
 		     "--full-index", "--cherry-pick", "--right-only",
-		     "--src-prefix=a/", "--dst-prefix=b/", "--no-renames",
+		     "--default-prefix", "--no-renames",
 		     "--no-cover-letter", "--pretty=mboxrd", "--topo-order",
 		     "--no-base", NULL);
 	if (opts->git_format_patch_opt.len)