RFR: 8235491: Tree/TableView: implementation of isSelected(int) violates contract [v6]

[Andy Goryachev]

> 1. reword SelectionModel.isSelected(int) javadoc, removing incorrect statement "Is functionally equivalent to calling <code>getSelectedIndices().contains(index)</code>." 
> 2. reimplement TableView.TableViewSelectionModel.isSelected(int) method to return true when at least one cell in *any* column is selected on the given row (was: *all* columns)
> 3. change selectRowWhenInSingleCellSelectionMode() and selectRowWhenInSingleCellSelectionMode2() in TableViewSelectionModelImplTest to reflect new reality.
> 
> NOTE: proposed change alters semantics of isSelected(int) method (in the right direction, in my opinion).

Andy Goryachev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 11 additional commits since the last revision:

 - 8235491: whitespace
 - 8235491: additional tests
 - Merge remote-tracking branch 'origin/master' into 8235491.isselected
 - 8235491: javadoc
 - 8235491: tree table view
 - Merge remote-tracking branch 'origin/master' into 8235491.isselected
 - 8235491: review comments
 - 8235491: whitespace
 - 8235491: javadoc
 - 8235491: 2022
 - ... and 1 more: https://git.openjdk.org/jfx/compare/c300ac30...ad3c70b9

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/839/files
  - new: https://git.openjdk.org/jfx/pull/839/files/6267a0e4..ad3c70b9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=839&range=05
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=839&range=04-05

  Stats: 447536 lines in 7514 files changed: 300975 ins; 103527 del; 43034 mod
  Patch: https://git.openjdk.org/jfx/pull/839.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/839/head:pull/839

PR: https://git.openjdk.org/jfx/pull/839