RFR: 8177945: Single cell selection flickers when adding data to TableView [v2]

[Ajit Ghaisas]

On Mon, 9 Nov 2020 09:39:11 GMT, Jose Pereda <jpereda at openjdk.org> wrote:

>> As discussed in the JBS [issue](https://bugs.openjdk.java.net/browse/JDK-8177945), there are some inconsistencies in the use of `VirtualContainerBase::requestRebuildCells` from `VirtualContainerBase::updateItemCount()`, which is implemented in the different skin classes for virtualised controls `TableViewSkinBase`, `ListViewSkin` or `TreeTableViewSkin`.
>> 
>> The latter already commented out this call (related to JDK-8155798 and JDK-8147483). 
>> 
>> This PR removes now the calls to `VirtualContainerBase::requestRebuildCells` from `TableViewSkinBase`  (except for the case `itemCount = 0` based on JDK-8118897 and JDK-8098235) and `ListViewSkin`.
>> 
>> A test is provided for TableView, that verifies that the `selected` pseudo-class state remains set for the selected cell while adding more items. Without this fix, as the cells are rebuilt, the pseudo-class states are clean and set all over again, thus the flickering.
>> 
>> For ListView, the test rt_35395 (JDK-8091726) is updated, as now there are way less calls to updateItem.
>
> Jose Pereda has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Address feedback

Marked as reviewed by aghaisas (Reviewer).

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PR: https://git.openjdk.java.net/jfx/pull/348