openjdk/jdk#9525 has changed behavior of PassFailJFrame. it doesn't call `setVisible()` from its constructor on instruction window anymore and some tests were not ready for that.
So adding `positionTestWindow()` fixes the issue. ------------- Commit messages: - initial Changes: https://git.openjdk.org/jdk20/pull/46/files Webrev: https://webrevs.openjdk.org/?repo=jdk20&pr=46&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8298905 Stats: 6 lines in 3 files changed: 4 ins; 2 del; 0 mod Patch: https://git.openjdk.org/jdk20/pull/46.diff Fetch: git fetch https://git.openjdk.org/jdk20 pull/46/head:pull/46 PR: https://git.openjdk.org/jdk20/pull/46
