[jdk25u] RFR: 8358532: JFileChooser in GTK L&F still displays HTML filename

[Alexey Ivanov]

This pull request contains a backport of commit [6fe9143b](https://github.com/openjdk/jdk/commit/6fe9143bbbe269af62d2084834fc0c9afc51b5f3) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Tejesh R on 16 Jun 2025 and was reviewed by Alexey Ivanov, Damon Nguyen and Alexander Zuev.

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Commit messages:
 - Backport 6fe9143bbbe269af62d2084834fc0c9afc51b5f3

Changes: https://git.openjdk.org/jdk25u/pull/216/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=216&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358532
  Stats: 7 lines in 2 files changed: 6 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk25u/pull/216.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/216/head:pull/216

PR: https://git.openjdk.org/jdk25u/pull/216