RFR: 8235491: Tree/TableView: implementation of isSelected(int) violates contract [v10]

[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 16 additional commits since the last revision:

 - Merge remote-tracking branch 'origin/master' into 8235491.isselected
 - 8235491: updated test
 - 8235491: removed unnecessary method
 - 8235491: delegate to super()
 - 8235491: revert clear selection
 - 8235491: whitespace
 - 8235491: additional tests
 - Merge remote-tracking branch 'origin/master' into 8235491.isselected
 - 8235491: javadoc
 - 8235491: tree table view
 - ... and 6 more: https://git.openjdk.org/jfx/compare/03253b00...35247bc6

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/839/files
  - new: https://git.openjdk.org/jfx/pull/839/files/76466935..35247bc6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=839&range=09
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=839&range=08-09

  Stats: 480 lines in 6 files changed: 450 ins; 10 del; 20 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