RFR: 8173321: Click on trough has no effect when cell height > viewport [v3]

[JoachimSchriek]

> This is my (Joachim.Schriek at gmx.de) first contribution to openjfx. My Contributor Agreement is signed but still in review.
> So please be patient with an absolute beginner as contributor ... .
> The work of this pull request was fully done in my spare time.
> 
> I first filed the bug myself in 2017. I had begun working with JavaFX in 2014.
> 
> The two changes address the two problems mentioned in JDK-8173321:
> - Using a JavaFX TableView, a click on the right trough has no effect when the cell height of the cell currently displayed is higher than viewport height
> - The ScrollBar ist displayed with a minimal height.
> 
> The changes were tested and ran well with Java 17 and the current master branch of openjfx.

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

  Deleted trailing whitespace

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/985/files
  - new: https://git.openjdk.org/jfx/pull/985/files/3360e186..7ad99bde

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=985&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=985&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/985.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/985/head:pull/985

PR: https://git.openjdk.org/jfx/pull/985