RFR: 8264127: ListCell editing status is true, when index changes while editing [v9]

[Florian Kirmaier]

> Fixing ListCell editing status is true, when index changes while editing.

Florian Kirmaier has updated the pull request incrementally with two additional commits since the last revision:

 - 8264127:
   Added more asserts to the ListCellTest, to make it more symmetric to the other test
 - 8264127:
   Removed the if from the ListCell tests

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/441/files
  - new: https://git.openjdk.java.net/jfx/pull/441/files/6012854d..3c00d890

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=441&range=08
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=441&range=07-08

  Stats: 20 lines in 1 file changed: 4 ins; 11 del; 5 mod
  Patch: https://git.openjdk.java.net/jfx/pull/441.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/441/head:pull/441

PR: https://git.openjdk.java.net/jfx/pull/441