There is something wrong with handling shift-arrow keys in TableView when multiple cell selection is enabled.

To reproduce, click on the top left cell (R0:C0), then press shift-right arrow 4 times, followed by shift-down arrow key 4 times, followed by shift-up arrow 4 times, followed by shift-left arrow 4 times. The expectation is that we should have no cells selected. Instead, there is a weird pattern of selected cells (see the screenshot).

There are probably other similar scenarios using different paths.

There is a unit test which is currently @ Ignored in TableViewKeyInputTest.testSelectionPathDeviationWorks1() - I think there might be problems with that test because the comments describing what's supposed to happen do not correspond to the code.