RFR: 8282093: LineChart path incorrect when outside lower bound [v2]

[Abhinay Agarwal]

> This regression was caused in PR #667 in which I didn't take into account the lower bounds. I have added more tests and one manual test along with the fix. The manual test can be used to identify any future issues with paths outside lower and upper bounds easily.

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

  Improve layout in manual test

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/744/files
  - new: https://git.openjdk.java.net/jfx/pull/744/files/ebc31fe1..bc0149f9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=744&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=744&range=00-01

  Stats: 23 lines in 1 file changed: 15 ins; 1 del; 7 mod
  Patch: https://git.openjdk.java.net/jfx/pull/744.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/744/head:pull/744

PR: https://git.openjdk.java.net/jfx/pull/744