RFR: 8284665: First selected item of a TreeItem multiple selection gets removed if new items are constantly added to the TreeTableView [v2]

[Ajit Ghaisas]

On Tue, 24 May 2022 09:51:29 GMT, Jose Pereda <jpereda at openjdk.org> wrote:

>> This PR fixes an issue with selection of multiple items in TableView and TreeTableView controls that gets moved unexpectedly when new items are added even way below the selected items.
>> 
>> A couple of tests have been added.  They fail without this PR (first selected item gets deselected, and table anchor gets moved), and pass with this PR (first selected item keeps selected, and table anchor remains at the same place).
>
> Jose Pereda has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:
> 
>  - Merge branch 'master' into 8284665-tableviewanchor
>  - Only shift anchor if existing one is affected by the change event, and tests

Marked as reviewed by aghaisas (Reviewer).

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PR: https://git.openjdk.java.net/jfx/pull/790