[jdk17u-dev] RFR: 8285867: Convert applet manual tests SelectionVisible.java to Frame and automate

[Goetz Lindenmaier]

I backport this for parity with 17.0.10-oracle.

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Commit messages:
 - Backport 44a60ce1724dc3e39faf1d7a68de2e6376894534

Changes: https://git.openjdk.org/jdk17u-dev/pull/1775/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1775&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8285867
  Stats: 208 lines in 4 files changed: 67 ins; 117 del; 24 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1775.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1775/head:pull/1775

PR: https://git.openjdk.org/jdk17u-dev/pull/1775