"As mentioned by Microsoft in its WPF font model whitepaper, the CSS model and apps only know to manage weight, width or slant qualifiers. So anything which is a weight, width or slant qualifier is a font face name, and anything else is a different font family." -- Nicolas Mailhot
By this definition, the Nimbus Sans and Nimbus Sans Narrow are the same font typefaces, so the AppStream and fontconfig files for Nimbus Sans Narrow were merged into corresponding Nimbus Sans files.
More info: https://goo.gl/n2unfn
By this definition, the Nimbus Sans and Nimbus Sans Narrow are the same font typefaces, so the AppStream and fontconfig files for Nimbus Sans Narrow were merged into corresponding Nimbus Sans files.