Allow the initialSelectedDate to be equal to startDate or endDate

[mikes222]

Please allow the initialSelectedDate to be equal to startDate or endDate.

Usecase is to set the startDate AND the initialSelectedDate to now()

if (initialSelectedDate != null &&
    startDate != null &&
    !initialSelectedDate!.isAfter(startDate!)) {
  throw Exception('initialSelectedDate must be a date after startDate');
}

if (initialSelectedDate != null &&
    endDate != null &&
    !initialSelectedDate!.isBefore(endDate!)) {
  throw Exception('initialSelectedDate must be a date before endDate');
}

[hukjordanjanaq]

#8 can you try?

[mikes222]

It works for me. @pasaneramusugoda could you please accept the PR from @jordanjanaq ?

[mikes222]

Since there was no reaction from the orignal author I decided to refactor the library and add the missing features by myself.

@pasaneramusugoda If you like to feel free to take over the code from https://github.com/mikes222/date_time_picker_widget and deploy a new version to pub.dev.