RFR: 8341286: TreeView: visual artifacts when setting new root with null value [v2]

[Ziad El Midaoui]

> Fix for phantom disclosure nodes appearing when root is null

Ziad El Midaoui has updated the pull request incrementally with one additional commit since the last revision:

  Update TreeCellSkin.java

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1838/files
  - new: https://git.openjdk.org/jfx/pull/1838/files/1a013988..2d832143

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1838&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1838&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1838.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1838/head:pull/1838

PR: https://git.openjdk.org/jfx/pull/1838