RFR: 8276490: Incorrect path for duplicate x and y values, when path falls outside axis bound [v2]

[Abhinay Agarwal]

> PathElements were skipped in AreaChart if the data point were outside axis bounds and had duplicate value for either x or y. This is now fixed with this PR.

Abhinay Agarwal has updated the pull request incrementally with one additional commit since the last revision:

  Fix condition and add more tests

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/667/files
  - new: https://git.openjdk.java.net/jfx/pull/667/files/07efa203..1381aaa4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=667&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=667&range=00-01

  Stats: 726 lines in 3 files changed: 534 ins; 11 del; 181 mod
  Patch: https://git.openjdk.java.net/jfx/pull/667.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/667/head:pull/667

PR: https://git.openjdk.java.net/jfx/pull/667