currentSheenChapter function Music
The index of the chapter that holds position in chapters (sorted by start), or -1 when there are none or
position is before the first.
Implementation
int currentSheenChapter(List<SheenChapter> chapters, Duration position) {
var at = -1;
for (var i = 0; i < chapters.length; i++) {
if (chapters[i].start <= position) at = i;
}
return at;
}