<i18n dev> RFR: 8300869: Make use of the Double.toString(double) algorithm in java.util.Formatter [v2]

[Raffaello Giulietti]

> Align `double` and `float` decimal conversions in `java.util.Formatter` with the algorithm used in `Double.toString(double)`.

Raffaello Giulietti has updated the pull request incrementally with one additional commit since the last revision:

  8300869: Make use of the Double.toString(double) algorithm in java.util.Formatter
  
  Added tests for known differences between current and new behavior.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12259/files
  - new: https://git.openjdk.org/jdk/pull/12259/files/bcbbe1e9..d42fbd03

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12259&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12259&range=00-01

  Stats: 188 lines in 20 files changed: 168 ins; 0 del; 20 mod
  Patch: https://git.openjdk.org/jdk/pull/12259.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12259/head:pull/12259

PR: https://git.openjdk.org/jdk/pull/12259