[jfx11u] RFR: 8276490: Incorrect path for duplicate x and y values, when path falls outside axis bound

[Johan Vos]

backport (18->11) for 8276490: Incorrect path for duplicate x and y values, when path falls outside axis bound

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Commit messages:
 - 8276490: Incorrect path for duplicate x and y values, when path falls outside axis bound

Changes: https://git.openjdk.java.net/jfx11u/pull/66/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=66&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276490
  Stats: 592 lines in 3 files changed: 581 ins; 1 del; 10 mod
  Patch: https://git.openjdk.java.net/jfx11u/pull/66.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx11u pull/66/head:pull/66

PR: https://git.openjdk.java.net/jfx11u/pull/66