in scripts/platform-content-handler.js [207:218]
function unfilterSourceset(sourceset) {
if (filteringContext.activeFilters.length === 0) {
filteringContext.activeFilters = filteringContext.dependencies[sourceset].concat([sourceset])
refreshFiltering()
filteringContext.dependencies[sourceset].concat([sourceset]).forEach(p => removeSourcesetFilterFromCache(p))
} else {
filteringContext.activeFilters.push(sourceset)
refreshFiltering()
removeSourcesetFilterFromCache(sourceset)
}
}