includeGlobPattern question?

[schlundus]

Hello,
i've got the following setup
// there's build directory, which I don't want to see in the file tree.. so I excluded it...

"files.exclude": {
....
        "app/build/": true,
....
}

and I want to fetch the css definition exactly from this build directory, because all CSS files used in my project are combined to one in that place .... so I tried to set the includeGlob to

"html-css-class-completion.includeGlobPattern": "app/build/**/*.{css,html}",

But the extension doesn't find any files (I believe that's normal because it's using the vsapi to fetch the files...)
If I enable the build directory in the files.exclude (=false) it works, but if I set it to true, it doesn't find files...

So, is there any way to use it in my way?