<i18n dev> RFR: JDK-6801704: ChoiceFormat::applyPattern inconsistency for invalid patterns [v6]

[Justin Lu]

> Please review this PR and [CSR](https://bugs.openjdk.org/browse/JDK-8317756) which defines the behavior for creating ChoiceFormats with incorrect patterns. The wording is added to both the ChoiceFormat constructor and ChoiceFormat::applyPattern method.
> 
> While ideally the inconsistent behavior itself could be fixed, this behavior has been long-standing for 20+ years and the benefit of consistent error handling does not outweigh the risk of breaking applications that may be relying on the "expected" incorrect behavior.
> 
> Examples of the range of behavior, (all examples violate the pattern syntax defined in the class description)
> 
> 
> // no limit -> throws an expected IllegalArgumentException
> var a = new ChoiceFormat("#foo");
> // no limit or relation in the last subPattern -> discards the incorrect portion, 'baz' and continues
> var b = new ChoiceFormat("0#foo|1#bar|baz"); 
> b.format(2); // returns 'bar'
> // no relation or limit -> discards the incorrect portion, 'foo' and continues
> var c = new ChoiceFormat("foo");
> c.format(1); // throws AIOOBE

Justin Lu has updated the pull request incrementally with one additional commit since the last revision:

  wording: punctuation and use 'constructor'

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17856/files
  - new: https://git.openjdk.org/jdk/pull/17856/files/8e5bbe05..aa1071e2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17856&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17856&range=04-05

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/17856.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17856/head:pull/17856

PR: https://git.openjdk.org/jdk/pull/17856