Attributes don't work in Tag Helper if newline precedes first attribute

[Daniel15]

Tag helper:

public class HelloTagHelper : TagHelper
{
    public string First { get; set; }
    public string Second { get; set; }

    public override void Process(TagHelperContext context, TagHelperOutput output)
    {
        output.TagName = "span";
        output.SelfClosing = false;
        output.Attributes.Add("data-first", First);
        output.Attributes.Add("data-second", Second);
    }
}

cshtml:

<hello first="1111" second="2222" />
<hello
    first="1111"
    second="2222"
/>
<hello first="1111"
       second="2222"
/>

Result:

<span data-first="1111" data-second="2222"></span>
<span data-first="" data-second=""></span>
<span data-first="1111" data-second="2222"></span>

The middle <hello /> tag has a newline before the first attribute, which seems to break it (all attributes come through as empty). The final <hello /> only has a newline before the second attribute, which seems to work.

Tested on beta 6.

[dougbu]

Just did a quick repro with current Beta 7 bits. It looks as if Razor generates nothing at all for the attributes in the newline-before-attributes case. Likely something is causing the attributes to have a null generator or they're lost completely.