[jdk21u-dev] RFR: 8355429: Open source ProgressMonitor test

Tue Aug 26 16:22:57 UTC 2025

Backporting JDK-8355429: Open source ProgressMonitor test. Tests that closing a progress monitor window will cancel it (without needing to press 'cancel'). Ran GHA Sanity Checks, local Tier 1 and 2, and new test directly. Patch is clean. Backporting for parity with Oracle.

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Commit messages:
 - Backport 3b7f43f95e061274020deaa1eecdb8182a6b64e1

Changes: https://git.openjdk.org/jdk21u-dev/pull/2126/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2126&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8355429
  Stats: 105 lines in 1 file changed: 105 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2126.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2126/head:pull/2126

PR: https://git.openjdk.org/jdk21u-dev/pull/2126