The `ComboBox` value was not set to previously selected value in the item list change listener when `setAll` method is used to change the item list. Fixed the issue by restoring the selection in this case.
Added a unit test to validate the fix ------------- Commit messages: - Fix item selection issue Changes: https://git.openjdk.org/jfx/pull/1452/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1452&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8279140 Stats: 33 lines in 2 files changed: 33 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jfx/pull/1452.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1452/head:pull/1452 PR: https://git.openjdk.org/jfx/pull/1452
