DatePicker: Validation error "INVALID_RANGE_DATES_SEQUENTIAL" when dates are the same

Describe the bug

If you have a datepicker using selectionMode=“range” and select the same date for the starting date and end date, you get an error saying that the start date is greater than the end date, which is incorrect. I tracked down the issue to this line: https://github.com/primefaces/primefaces/blob/master/primefaces/src/main/java/org/primefaces/component/datepicker/DatePicker.java#L178

I changed it in my local copy of primefaces from:

 if (isValid() && startDate.compareTo(endDate) > -1) {
         setValid(false);
         validationResult = ValidationResult.INVALID_RANGE_DATES_SEQUENTIAL;
 }

to:

 if (isValid() && startDate.compareTo(endDate) > 0) {
         setValid(false);
         validationResult = ValidationResult.INVALID_RANGE_DATES_SEQUENTIAL;
 }

Which fixed the issue

Reproducer

No response

Expected behavior

No validation error should occur when the dates are the same.

PrimeFaces edition

Community

PrimeFaces version

12.0.0-RC3

Theme

No response

JSF implementation

All

JSF version

Any

Java version

Any

Browser(s)

Any

[melloware]

PR Submitted letting the integration tests run now

[newk5]

Also as I said above I chose the same exact month for both the start and end date so those values there on the debugger are correct.