Fixes JDK-8302983 (and duplicate JDK-8302898) -------------
Commit messages: - 8302983: ZoneRulesProvider.registerProvider() twice will remove provider Changes: https://git.openjdk.org/jdk/pull/12690/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12690&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8302983 Stats: 53 lines in 2 files changed: 49 ins; 0 del; 4 mod Patch: https://git.openjdk.org/jdk/pull/12690.diff Fetch: git fetch https://git.openjdk.org/jdk pull/12690/head:pull/12690 PR: https://git.openjdk.org/jdk/pull/12690
