It is possible situation when `clearSelection()` is invoked during `onChange()` notify. In such case `selectedCellsSeq` is clearing and possible `IndexOutOfBoundsException` on `GenericAddRemoveChange` creation. So we should check it to create correct `GenericAddRemoveChange`.
------------- Commit messages: - 8194924: Checking for selection size before update Changes: https://git.openjdk.java.net/jfx/pull/542/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=542&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8194924 Stats: 12 lines in 2 files changed: 11 ins; 0 del; 1 mod Patch: https://git.openjdk.java.net/jfx/pull/542.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/542/head:pull/542 PR: https://git.openjdk.java.net/jfx/pull/542
