RFR: 8256397: MultipleSelectionModel throws IndexOutOfBoundException [v2]

[Florian Kirmaier]

> Fixing IndexOutOfBoundsException in the MultipleSelectionModelBase and added a unit-test for it.
> ticket: https://bugs.openjdk.java.net/browse/JDK-8256397
> run test: `./gradlew --continue -PFULL_TEST=true controls:test --tests "*MultipleSelectionModelImplTest*"`

Florian Kirmaier has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains one additional commit since the last revision:

  8256397
  Fixing IndexOutOfBoundsException in the MultipleSelectionModelBase and added a unit-test for it.

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

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/353/files
  - new: https://git.openjdk.java.net/jfx/pull/353/files/08f6abbf..2f6dd153

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=353&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=353&range=00-01

  Stats: 727295 lines in 11058 files changed: 385829 ins; 235008 del; 106458 mod
  Patch: https://git.openjdk.java.net/jfx/pull/353.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/353/head:pull/353

PR: https://git.openjdk.java.net/jfx/pull/353