This change is to fix a regression caused by the fix to [JDK-8234347](https://bugs.openjdk.org/browse/JDK-8234347). The previous fix was simply disabling offset-based parsing if the parser was text-based. Instead, check if it is an offset or not by explicitly comparing the character with '+'/'-' and continue offset parsing if it is.
------------- Commit messages: - 8303440: The "ZonedDateTime.parse" may not accept the "UTC+XX" zone id Changes: https://git.openjdk.org/jdk/pull/12868/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12868&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8303440 Stats: 81 lines in 2 files changed: 79 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/12868.diff Fetch: git fetch https://git.openjdk.org/jdk pull/12868/head:pull/12868 PR: https://git.openjdk.org/jdk/pull/12868
