[jdk21u-dev] RFR: 8358813: JPasswordField identifies spaces in password via delete shortcuts

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle.

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Commit messages:
 - Backport 8d73fe91bccd1da53424b9f8a52d9efafabeb243

Changes: https://git.openjdk.org/jdk21u-dev/pull/2429/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2429&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358813
  Stats: 121 lines in 2 files changed: 121 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2429.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2429/head:pull/2429

PR: https://git.openjdk.org/jdk21u-dev/pull/2429