Bug ID: JDK-8193800 TreeTableView selection changes on sorting

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JDK 8	Other
8u261Fixed	openjfx11.0.9Fixed

In a multi-column TreeTableView using the built-in JavaFX sorting solution 
causing the selection model's selected index and selected item properties' 
change.

This is continuation of the bug JDK-8185635 to get 'Issue 1' listed in JDK-8185635 fixed in 11 or asap. Note: 'Issue 2' listed in the JDK-8185635 already fixed in JDK9.

Changeset: 2ca509a1 Author: Ambarish Rapte <arapte@openjdk.org> Date: 2020-06-29 05:48:19 +0000 URL: https://git.openjdk.java.net/jfx/commit/2ca509a1
29-06-2020
There are 2 parts to it 1) Exception and 2) selection code (on sorting) itself is wrong 1 (Exception) is already fixed since JDK9 and back-porting is also not straight forward and may be high effort, i will let Ajit comment on it. 2 (Persistence of selection on sorting) is open for both 12 and 8u, so fix in 12 and backport is possible, this is high effort, requires design change.
18-11-2018
Praveen, For more detailed description of the issues - please refer comment by Fairoz on JDK-8185635. I am planning to address the exception (Issue 1) as noted in description of this bug for openjfx12 & 8u Issue 2 (TreeTableView selection changes on sorting action) exists in both - openjfx12 & 8u - It is more involved and might need re-designing as suggested by Jonathan in a comment on JDK-8185635.
09-10-2018
Update is - it is still work in progress. The row selection is getting cleared multiple times on sorting. Trying to understand why such multiple invocations needed in first place?
04-10-2018

Duplicate :	JDK-8170080 - TreeTableView: Selection is not restored correctly for nodes with a depth greater one
Duplicate :	JDK-8185635 - TreeTableView selection changes on sorting
Relates :	JDK-8225156 - IndexOutOfBoundsException when sorting TreeTableView with multiple rows selected
Relates :	JDK-8248217 - �� TreeTableView selection issues
Relates :	JDK-8256283 - IndexOutOfBoundsException when sorting a TreeTableView
Relates :	JDK-8245181 - TreeTableViewTest > test_rt35039_resetRootChildren logs an exception
Relates :	JDK-8090563 - Tree/Item/ModificationEvent: must fully support list changes
Relates :	JDK-8185635 - TreeTableView selection changes on sorting