Add note in doc and API comment that rowCount should be odd

[gargVader]

When the rowCount is even, then the middle two rows are highlighted. Odd count gives correct behavior

[commandiron]

Hi, you are right. I realized before. Comment could be useful too. I will add next release. Actually row count must be get only odd paramenters but i couldn't find any function about this like IntRange. Any idea?

[kasiopec]

You could maybe do something like
val rowCount = if (listPickerContent.size % 2 == 0) listPickerContent.size + 1 else listPickerContent.size