[jdk25u] RFR: 8358813: JPasswordField identifies spaces in password via delete shortcuts

[Alexey Ivanov]

This pull request contains a backport of commit [8d73fe91](https://github.com/openjdk/jdk/commit/8d73fe91bccd1da53424b9f8a52d9efafabeb243) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Jeremy Wood on 7 Aug 2025 and was reviewed by Alexey Ivanov and Damon Nguyen.

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Commit messages:
 - Backport 8d73fe91bccd1da53424b9f8a52d9efafabeb243

Changes: https://git.openjdk.org/jdk25u/pull/132/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=132&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/jdk25u/pull/132.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/132/head:pull/132

PR: https://git.openjdk.org/jdk25u/pull/132