RFR: 8276553: ListView scrollTo() is broken after fix for JDK-8089589 [v3]

[Johan Vos]

> After (re)setting the number of elements, make sure to do at least some estimation of the total size.
> Added a testcase for this scenario.

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

  process reviewer comment (simplify call)

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/683/files
  - new: https://git.openjdk.java.net/jfx/pull/683/files/b3fe2756..1a25a6d5

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=683&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=683&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx/pull/683.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/683/head:pull/683

PR: https://git.openjdk.java.net/jfx/pull/683