Function icon_svg 

pub fn icon_svg(icon: Icon) -> String

icon as an app’s icon artwork: the glyph stroked in white on a rounded tile of the accent gradient, as a standalone SVG document. A package that names a platform glyph as its icon (a tilolang app’s icon: .note) ships this as its signed icon file, so the launcher grid, search and the window chrome show the same artwork as any app with its own.