RFR: 8273336: Clicking a selected cell from a group of selected cells in a TableView clears the selected items list but remains selected [v2]

[Jose Pereda]

> This PR adds a predicate to TableView and TreeTableView selection models order to remove rows from the selection only when there are no selected cells in that given row, when cell selection is enabled.
> 
> Two tests have been added as well, that fail without this PR and pass with it.

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

  Address feedback from reviewer

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/709/files
  - new: https://git.openjdk.java.net/jfx/pull/709/files/34491051..fe943d4b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=709&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=709&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/709.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/709/head:pull/709

PR: https://git.openjdk.java.net/jfx/pull/709