in js/reveal.js [3752:3765]
function navigateRight() {
// Reverse for RTL
if( config.rtl ) {
if( ( isOverview() || previousFragment() === false ) && availableRoutes().right ) {
slide( indexh - 1 );
}
}
// Normal navigation
else if( ( isOverview() || nextFragment() === false ) && availableRoutes().right ) {
slide( indexh + 1 );
}
}