Function load_icon_indicator 

pub fn load_icon_indicator(set: IconSet) -> Option<AnimatedIcon>

Load the animated loading indicator for the given set.

Returns None for sets without an animated spinner (SfSymbols, SegoeIcons). For a freedesktop spinner from a specific theme, use FreedesktopLoader::load_indicator directly.

Each set needs its loader’s feature (see the loaders); None without it.