RFR: 8276167: VirtualFlow.scrollToTop doesn't scroll to the top of the last element [v3]

[eduardsdv]

> Fix VirtualFlow.scrollToTop(int) doesn't scroll to the top of the last element but to the bottom of the last element.

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

  8276170: Add junit for VirtualFlow.scrollToTop(int)

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/656/files
  - new: https://git.openjdk.java.net/jfx/pull/656/files/a7820448..588a7e41

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=656&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=656&range=01-02

  Stats: 37 lines in 1 file changed: 37 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/656.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/656/head:pull/656

PR: https://git.openjdk.java.net/jfx/pull/656