mergetool: fix running in subdir when rerere enabled

"git mergetool" (without any pathspec on the command line) that is
not run from the top-level of the working tree no longer works in
Git v2.11, failing to get the list of unmerged paths from the output
of "git rerere remaining".  This regression was introduced by
57937f7 ("mergetool: honor diff.orderFile", 2016-10-07).

This is because the pathnames output by the 'git rerere remaining'
command are relative to the top-level directory but the 'git diff
--name-only' command expects its pathname arguments to be relative
to the current working directory.  To make everything consistent,
cd_to_toplevel before running 'git diff --name-only' and adjust any
relative pathnames.

Signed-off-by: Richard Hansen <hansenr@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: rhansen

git-mergetool.sh

@@ -454,21 +454,34 @@ main () {
 	merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"
 	merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
 
+	prefix=$(git rev-parse --show-prefix) || exit 1
+	cd_to_toplevel
+
+	if test -n "$orderfile"
+	then
+		orderfile=$(
+			git rev-parse --prefix "$prefix" -- "$orderfile" |
+			sed -e 1d
+		)
+	fi
+
 	if test $# -eq 0 && test -e "$GIT_DIR/MERGE_RR"
 	then
 		set -- $(git rerere remaining)
 		if test $# -eq 0
 		then
 			print_noop_and_exit
 		fi
+	elif test $# -ge 0
+	then
+		# rev-parse provides the -- needed for 'set'
+		eval "set $(git rev-parse --sq --prefix "$prefix" -- "$@")"
 	fi
 
 	files=$(git -c core.quotePath=false \
 		diff --name-only --diff-filter=U \
 		${orderfile:+"-O$orderfile"} -- "$@")
 
-	cd_to_toplevel
-
 	if test -z "$files"
 	then
 		print_noop_and_exit

t/t7610-mergetool.sh

@@ -234,7 +234,7 @@ test_expect_success 'mergetool merges all from subdir (rerere disabled)' '
 	)
 '
 
-test_expect_failure 'mergetool merges all from subdir (rerere enabled)' '
+test_expect_success 'mergetool merges all from subdir (rerere enabled)' '
 	test_when_finished "git reset --hard" &&
 	git checkout -b test$test_count branch1 &&
 	test_config rerere.enabled true &&
@@ -678,6 +678,11 @@ test_expect_success 'diff.orderFile configuration is honored' '
 		b
 		a
 	EOF
+
+	# make sure "order-file" that is ambiguous between
+	# rev and path is understood correctly.
+	git branch order-file HEAD &&
+
 	git mergetool --no-prompt --tool myecho >output &&
 	git grep --no-index -h -A2 Merging: output >actual &&
 	test_cmp expect actual