RFR: 8319147: Add regression test for JDK-8317836 [v2]

[Prasanta Sadhukhan]

> A manual regression test for JFXPanel orientation fix in [JDK-8317836](https://bugs.openjdk.org/browse/JDK-8317836) is added

Prasanta Sadhukhan has updated the pull request incrementally with two additional commits since the last revision:

 - Formatting
 - Modify window size

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1276/files
  - new: https://git.openjdk.org/jfx/pull/1276/files/e2c4dfd7..aa852af2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1276&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1276&range=00-01

  Stats: 4 lines in 1 file changed: 1 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jfx/pull/1276.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1276/head:pull/1276

PR: https://git.openjdk.org/jfx/pull/1276