Environment:

OS X 10.8.2

java version "1.7.0_10-ea"
Java(TM) SE Runtime Environment (build 1.7.0_10-ea-b08)
Java HotSpot(TM) 64-Bit Server VM (build 23.6-b03, mixed mode)

javafx.runtime.version: 2.2.4-ea-b08

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Steps.

1. In your favorite IDE with the output console open, run the TableSample app attached to this issue.

2. With the down arrow key gesture, select the first row. Output as expected for a single row selected:

Selected: 1 item(s) [0]: Jacob

3. Then select the second row by arrow-down gesture. Output as expected for a single row selected:

Selected: 1 item(s) [1]: Isabella

4. Move the selection back up to the first row using the arrow-up gesture. Output as expected:

Selected: 1 item(s) [0]: Jacob

5. Perform a single Shift-(down-arrow) gesture to extend the selection by one row. Output shows:

Selected: 3 item(s) [0, 0, 1]: Jacob Jacob Isabella

6. Continue Shift-down-arrow multi-selection gesture to include all rows: Output shows duplicate rows in the selection collections (indices and items):

Selected: 7 item(s) [0, 0, 1, 0, 2, 0, 3]: Jacob Jacob Isabella Jacob Ethan Jacob Emma
Selected: 7 item(s) [0, 0, 1, 0, 2, 0, 3]: Jacob Jacob Isabella Jacob Ethan Jacob Emma

7. Now play with all kinds of multiple selection keyboard initiated gestures, moving up and down with the current selection and take note of the duplications, which I will not show here.

Record your actions and make sure you write unit tests which cover those ... and more.

...

Now for something very strange, meaning "for gestures which work as expected".

1. Clear the selection and use the down-arrow gesture to go to the last row.

2. Shift-up-arrow select up gesture to the first row. Progressively, the output contains no duplicate indices or items, as expected.

Selected: 1 item(s) [4]: Michael
Selected: 2 item(s) [4, 3]: Michael Emma
Selected: 3 item(s) [3, 4, 2]: Emma Michael Ethan
Selected: 4 item(s) [3, 2, 4, 1]: Emma Ethan Michael Isabella
Selected: 5 item(s) [3, 2, 1, 4, 0]: Emma Ethan Isabella Michael Jacob

3. Work your way down and then up with the Shift-key-pressed gesture and you will see the expected results. For down-arrowing progressively from the previous step:

Selected: 4 item(s) [3, 2, 1, 4]: Emma Ethan Isabella Michael
Selected: 3 item(s) [3, 2, 4]: Emma Ethan Michael
Selected: 2 item(s) [3, 4]: Emma Michael
Selected: 1 item(s) [4]: Michael

Just as expected.


So, some gestures work, namely, those which start/originate in the upward direction.

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Note that the attachment contains an Eclipse project with the source code. Sorry, no NetBeans project included.