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

[Florian Kirmaier]

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

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Commit messages:
 - 8264127:

Changes: https://git.openjdk.java.net/jfx/pull/441/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=441&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264127
  Stats: 11 lines in 2 files changed: 11 ins; 0 del; 0 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