This PR contains a fix that was de-scoped from #480 and solves an issue where an incorrect index is used in `MultipleSelectionModelBase.SelectedIndicesList.clear(int)`.
------------- Commit messages: - Fixed incorrect index - Failing test Changes: https://git.openjdk.java.net/jfx/pull/492/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=492&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8266539 Stats: 17 lines in 2 files changed: 14 ins; 0 del; 3 mod Patch: https://git.openjdk.java.net/jfx/pull/492.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/492/head:pull/492 PR: https://git.openjdk.java.net/jfx/pull/492
