RFR: 8327007: javax/swing/JSpinner/8008657/bug8008657.java fails

[Prasanta Sadhukhan]

Test failed with the exception java.lang.IllegalArgumentException: (start <= value <= end) with no history of failing till date.
Investigation shows SpinnerDateModel constructor condition is not satisfied because
It seems it's a leap year problem that is being manifested..

As per test,
initDate Thu Feb 29 13:49:08 IST 2024 [ obtained by calendar.getTime();]
earliestDate Tue Feb 28 13:49:08 IST 2023 [obtained by calendar.add(Calendar.YEAR, -1);]
latestDate Wed Feb 28 13:49:08 IST 2024 [obtained by calendar.add(Calendar.YEAR, 1);]

Now, as per SpinnerDateModel constructor
earliestDate <= initDate condition is satisfied
but
latestDate >= initDate is not
so [start <= value <= end](https://github.com/openjdk/jdk/blob/998d0baab0fd051c38d9fd6021628eb863b80554/src/java.desktop/share/classes/javax/swing/SpinnerDateModel.java#L185) condition fails

Not sure it anything can be done in Calendar class for this but fix is done in test taking leapyear into account so that we add a day if it's a leapyear when we consecutively do Calendar.add(YEAR, -1) and Calendar.add(YEAR,1) on leapyear date of 29Feb

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Commit messages:
 - 8327007: javax/swing/JSpinner/8008657/bug8008657.java fails

Changes: https://git.openjdk.org/jdk/pull/18054/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18054&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327007
  Stats: 11 lines in 1 file changed: 11 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18054.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18054/head:pull/18054

PR: https://git.openjdk.org/jdk/pull/18054