func (p *Palette) routineColor(bucket *stack.Bucket, multipleBuckets bool) string {
	if bucket.First && multipleBuckets {
		return p.RoutineFirst
	}
	return p.Routine
}
func (p *Palette) routineColor(bucket *stack.Bucket, multipleBuckets bool) string {
	if bucket.First && multipleBuckets {
		return p.RoutineFirst
	}
	return p.Routine
}
// routineColor returns the color for the header of the goroutines bucket.