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

[lawrence.andrews]

> 1) Removed Applet dependent code and used Frame as top level.
> 2) Automated the manual test.
> 
> @shurymury

lawrence.andrews has updated the pull request incrementally with one additional commit since the last revision:

  Fixed disposing of frame with in EDT

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8477/files
  - new: https://git.openjdk.java.net/jdk/pull/8477/files/f5cbf47a..b0839985

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8477&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8477&range=00-01

  Stats: 15 lines in 2 files changed: 4 ins; 9 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8477.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8477/head:pull/8477

PR: https://git.openjdk.java.net/jdk/pull/8477