<i18n dev> RFR: 8341366: Suspicious check in Locale.getDisplayName(Locale inLocale) [v2]

[Justin Lu]

> Please review this PR which modifies a suspicious check in the fallback of `Locale.getDisplayName(Locale inLocale)`.
> 
> As a fallback, a hard coded pattern is used. The previous code outputted the qualifiers if the `displayNames` array had length greater than 2. Just a few lines above, the array is initialized with a length of 3 and so the check is pointless.
> 
> It would be better, if replaced with a null check for the last element of the `displayNames` array, as that element may be null if there are no qualifiers. See L2317 ,
> 
> `qualifierNames.length != 0 ? formatList(qualifierNames, listCompositionPattern) : null`
> 
> For example, now a fallback (with no qualifiers) might look like: `German` instead of `German (null)`.
> But will remain the same (with qualifiers): `German (Germany)`.

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

  reflect review - chain appends

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21298/files
  - new: https://git.openjdk.org/jdk/pull/21298/files/e50424bb..2cfa9de7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21298&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21298&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/21298.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21298/head:pull/21298

PR: https://git.openjdk.org/jdk/pull/21298