<i18n dev> RFR: JDK-8326908: DecimalFormat::toPattern throws OutOfMemoryError when pattern is empty string [v2]

[Justin Lu]

> Please review this PR and corresponding CSR which prevents an OutOfMemoryError by restricting the initial maximum fraction digits for an empty pattern DecimalFormat.
> 
> For an empty String pattern DecimalFormat, the maximum fraction digits is initialized to `Integer.MAX_VALUE`. When toPattern() is invoked, StringBuilder internally doubles capacity attempting to append Integer.MAX_VALUE digits until OOME occurs. CSR covers potential behavioral compatibility changes.

Justin Lu has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - cleanup/typo
 - Merge branch 'master' into JDK-8326908-emptyPattern-OOME
 - implement feedback + improve pattern related tests
 - minor additions
 - init

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18094/files
  - new: https://git.openjdk.org/jdk/pull/18094/files/fc8a7ce4..7ca56500

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18094&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18094&range=00-01

  Stats: 5885 lines in 919 files changed: 2483 ins; 1248 del; 2154 mod
  Patch: https://git.openjdk.org/jdk/pull/18094.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18094/head:pull/18094

PR: https://git.openjdk.org/jdk/pull/18094