RFR: 8284676: TreeTableView loses sort ordering when applied on empty table [v2]

[Jose Pereda]

On Wed, 13 Jul 2022 05:06:45 GMT, Ambarish Rapte <arapte at openjdk.org> wrote:

>> Issue: In a TreeTableView if root item has no children then TreeTableView does not retain if a sort order is set.
>> 
>> Cause: This is a regression of fix for [JDK-8256283](https://bugs.openjdk.org/browse/JDK-8256283), which returned false from `SortPolicy.call()` function if root item has no children. This function is called from `TreeTableView.sort()` line #1863. When the returned value is false then line #1885 gets executed, which removes the sort order that was added.
>> 
>> Fix: The fix for [JDK-8256283](https://bugs.openjdk.org/browse/JDK-8256283) is modified to return true instead. Added a test that fails without and passes with fix.
>
> Ambarish Rapte has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review comment: correct test name

Marked as reviewed by jpereda (Committer).

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PR: https://git.openjdk.org/jfx/pull/825