git prompt: use toplevel to find untracked files

The __git_ps1() prompt function would not show an untracked state
when all the untracked files are outside the current working
directory.
Signed-off-by: NCody A Taylor <codemister99@yahoo.com>
Helped-by: NSZEDER Gábor <szeder@ira.uka.de>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

contrib/completion/git-prompt.sh

@@ -474,7 +474,7 @@ __git_ps1 ()
 
 		if [ -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" ] &&
 		   [ "$(git config --bool bash.showUntrackedFiles)" != "false" ] &&
-		   git ls-files --others --exclude-standard --error-unmatch -- '*' >/dev/null 2>/dev/null
+		   git ls-files --others --exclude-standard --error-unmatch -- ':/*' >/dev/null 2>/dev/null
 		then
 			u="%${ZSH_VERSION+%}"
 		fi

t/t9903-bash-prompt.sh

@@ -395,6 +395,17 @@ test_expect_success 'prompt - untracked files status indicator - untracked files
 	test_cmp expected "$actual"
 '
 
+test_expect_success 'prompt - untracked files status indicator - untracked files outside cwd' '
+	printf " (master %%)" >expected &&
+	(
+		mkdir -p ignored_dir &&
+		cd ignored_dir &&
+		GIT_PS1_SHOWUNTRACKEDFILES=y &&
+		__git_ps1 >"$actual"
+	) &&
+	test_cmp expected "$actual"
+'
+
 test_expect_success 'prompt - untracked files status indicator - shell variable unset with config disabled' '
 	printf " (master)" >expected &&
 	test_config bash.showUntrackedFiles false &&