RFR: 8307538: Memory leak in TreeTableView when calling refresh [v6]

[Andy Goryachev]

> Fixed a memory leak in TreeTableView by reverting to register**Listener (which is ok in this particular situation) - the leak is specific to TreeTableRowSkin.
> 
> Added a unit test.

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

  John is right

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1129/files
  - new: https://git.openjdk.org/jfx/pull/1129/files/a4cdc148..e1b72a13

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1129&range=05
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1129&range=04-05

  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx/pull/1129.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1129/head:pull/1129

PR: https://git.openjdk.org/jfx/pull/1129