[jdk11u-dev] RFR: 8285867: Convert applet manual tests SelectionVisible.java to Frame and automate [v2]

[Amos Shi]

> Backport of [JDK-8285867](https://bugs.openjdk.org/browse/JDK-8285867)
> 
> Clean Backport: git apply succeeded, no manual edit, although the bot did not add the `clean` label somehow
> 
> Tests
> - Test Succeeded in local Dev Apple M1 Laptop
> - PR - All checks have passed
> - SAP nightlies: to run

Amos Shi has updated the pull request incrementally with one additional commit since the last revision:

  Backport 44a60ce1724dc3e39faf1d7a68de2e6376894534

-------------

Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/2360/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/2360/files/25ff57ae..6fa31ae9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2360&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2360&range=00-01

  Stats: 0 lines in 2 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2360.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2360/head:pull/2360

PR: https://git.openjdk.org/jdk11u-dev/pull/2360