{FOO (
	[tag]
	[/tag])}

{BAR (
	[tag]
	[/tag]
)}

{BAZ (
	{FOO (
		[tag]
		[/tag])} )}

{BAZ (
	{FOO (
		[tag]
		[/tag]
	)}
)}

------------------------------------------------------------------------------------

shadowm@nanacore:~/src/wesnoth% wmlindent < indent-test
{FOO (
    [tag]
    [/tag])}

    {BAR (
        [tag]
        [/tag]
    )}

    {BAZ (
        {FOO (
            [tag]
            [/tag])} )}

            {BAZ (
                {FOO (
                    [tag]
                    [/tag]
                )}
            )}
wmlindent: "standard input". line 21: end of file with indent nonzero.