commit: restore --edit when combined with --fixup

Recent changes to --fixup, adding amend suboption, caused the
--edit flag to be ignored as use_editor was always set to zero.

Restore edit_flag having higher priority than fixup_message when
deciding the value of use_editor by moving the edit flag condition
later in the method.

Signed-off-by: Joel Klinghed <the_jk@spawned.biz>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/commit.c

@@ -1253,8 +1253,6 @@ static int parse_and_validate_options(int argc, const char *argv[],
 
 	if (logfile || have_option_m || use_message)
 		use_editor = 0;
-	if (0 <= edit_flag)
-		use_editor = edit_flag;
 
 	/* Sanity check options */
 	if (amend && !current_head)
@@ -1344,6 +1342,9 @@ static int parse_and_validate_options(int argc, const char *argv[],
 		}
 	}
 
+	if (0 <= edit_flag)
+		use_editor = edit_flag;
+
 	cleanup_mode = get_cleanup_mode(cleanup_arg, use_editor);
 
 	handle_untracked_files_arg(s);

t/t7500-commit-template-squash-signoff.sh

@@ -270,7 +270,7 @@ EOF
 
 test_expect_success 'commit --fixup provides correct one-line commit message' '
 	commit_for_rebase_autosquash_setup &&
-	git commit --fixup HEAD~1 &&
+	EDITOR="echo ignored >>" git commit --fixup HEAD~1 &&
 	commit_msg_is "fixup! target message subject line"
 '
 
@@ -281,6 +281,13 @@ test_expect_success 'commit --fixup -m"something" -m"extra"' '
 
 extra"
 '
+test_expect_success 'commit --fixup --edit' '
+	commit_for_rebase_autosquash_setup &&
+	EDITOR="printf \"something\nextra\" >>" git commit --fixup HEAD~1 --edit &&
+	commit_msg_is "fixup! target message subject linesomething
+extra"
+'
+
 get_commit_msg () {
 	rev="$1" &&
 	git log -1 --pretty=format:"%B" "$rev"