<i18n dev> RFR: 8367901: Calendar.roll(hour, 24) returns wrong result

[Justin Lu]

Please review this PR which addresses an edge case for `GregorianCalendar.roll(int, int)` when the rolled amount would cause the hour to remain the same as before the call. After this change, the expected hour is returned. That is, rolling a full cycle for HOUR (12 hours) and HOUR_OF_DAY (24 hours) should keep the hour the same as before the call.

For example, a calendar with HOUR_OF_DAY == 15,


cal.roll(Calendar.HOUR_OF_DAY, 23);
cal.get(Calendar.HOUR_OF_DAY); // returns 14


cal.roll(Calendar.HOUR_OF_DAY, 24);
// Incorrectly returns 16. A full cycle is expected to return the starting hour (15)
cal.get(Calendar.HOUR_OF_DAY); 


cal.roll(Calendar.HOUR_OF_DAY, 25);
cal.get(Calendar.HOUR_OF_DAY); // returns 16

-------------

Commit messages:
 - init

Changes: https://git.openjdk.org/jdk/pull/27355/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27355&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367901
  Stats: 92 lines in 2 files changed: 89 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/27355.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27355/head:pull/27355

PR: https://git.openjdk.org/jdk/pull/27355