completion: bisect: complete log opts for visualize subcommand

Arguments passed to the "visualize" subcommand of git-bisect(1) get
forwarded to git-log(1). It thus supports the same options as git-log(1)
would, but our Bash completion script does not know to handle this.

Make completion of porcelain git-log options and option arguments to the
visualize subcommand work by calling __git_complete_log_opts when the
start of an option to the subcommand is seen (visualize doesn't support
any options besides the git-log options).  Add test.

Signed-off-by: Britton Leo Kerin <britton.kerin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/completion/git-completion.bash

@@ -1490,6 +1490,10 @@ _git_bisect ()
 		__gitcomp "--term-good --term-old --term-bad --term-new"
 		return
 		;;
+	visualize)
+		__git_complete_log_opts
+		return
+		;;
 	bad|new|"$term_bad"|good|old|"$term_good"|reset|skip)
 		__git_complete_refs
 		;;

t/t9902-completion.sh

@@ -1361,6 +1361,21 @@ test_expect_success 'git-bisect - options to terms subcommand are candidates' '
 	)
 '
 
+test_expect_success 'git-bisect - git-log options to visualize subcommand are candidates' '
+	(
+		cd git-bisect &&
+		# The completion used for git-log and here does not complete
+		# every git-log option, so rather than hope to stay in sync
+		# with exactly what it does we will just spot-test here.
+		test_completion "git bisect visualize --sta" <<-\EOF &&
+		--stat Z
+		EOF
+		test_completion "git bisect visualize --summar" <<-\EOF
+		--summary Z
+		EOF
+	)
+'
+
 test_expect_success 'git checkout - completes refs and unique remote branches for DWIM' '
 	test_completion "git checkout " <<-\EOF
 	HEAD Z