My brain after spending far too long debugging whitespace-related issues and space-sanitizing AppStream description markup... https://www.youtube.com/watch?v=xkfsybBhueM The good thing: The solution *sped up* markup parsing in the end, because it made subsequent steps handle less data :-) AppStream 1.2.0 will make sure description markup is safe to render, and make markup far more deterministic, which will help software centers.